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Fair Value Measurements - Assets Accounted for at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | $ 509,252 | $ 469,747
Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 369,366 |
Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 89,346
Cash and Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 137,286 | 347,392
Restricted Cash and Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 2,600 | 33,009
U.S. Government Obligations and Agencies [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 104,532 |
U.S. Government Obligations and Agencies [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 4,009
Corporate Bonds [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 98,978 |
Mortgage-Backed and Asset-Backed Securities [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 94,994 |
Common Stock [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 20,057 |
Mutual Funds [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 50,805 |
Equity Securities, Common Stock, Metals and Mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 26,130
Equity Securities, Common Stock, Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 10,868
Equity Securities, Common Stock, Other [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 8,215
Equity Securities, Exchange-Traded and Mutual Funds, Metals and Mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 21,989
Equity Securities, Exchange-Traded and Mutual Funds, Agriculture [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 10,265
Equity Securities, Exchange-Traded and Mutual Funds, Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 5,068
Equity Securities, Exchange-Traded and Mutual Funds, Indices [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 2,506
Other Investments [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 317
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 509,252 | 469,747
Fair Value, Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 369,366 |
Fair Value, Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 89,346
Fair Value, Measurements, Recurring [Member] | Cash and Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 137,286 | 347,392
Fair Value, Measurements, Recurring [Member] | Restricted Cash and Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 2,600 | 33,009
Fair Value, Measurements, Recurring [Member] | U.S. Government Obligations and Agencies [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 104,532 |
Fair Value, Measurements, Recurring [Member] | U.S. Government Obligations and Agencies [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 4,009
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 98,978 |
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed and Asset-Backed Securities [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 94,994 |
Fair Value, Measurements, Recurring [Member] | Common Stock [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 20,057 |
Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 50,805 |
Fair Value, Measurements, Recurring [Member] | Equity Securities, Common Stock, Metals and Mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 26,130
Fair Value, Measurements, Recurring [Member] | Equity Securities, Common Stock, Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 10,868
Fair Value, Measurements, Recurring [Member] | Equity Securities, Common Stock, Other [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 8,215
Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Metals and Mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 21,989
Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Agriculture [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 10,265
Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 5,068
Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Indices [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 2,506
Fair Value, Measurements, Recurring [Member] | Non-Hedging Derivate Liability, Net [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | (21)
Fair Value, Measurements, Recurring [Member] | Other Investments [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 317
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 210,748 | 465,759
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 70,862 |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 85,358
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Cash and Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 137,286 | 347,392
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Restricted Cash and Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 2,600 | 33,009
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Common Stock [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 20,057 |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 50,805 |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Common Stock, Metals and Mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 26,130
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Common Stock, Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 10,868
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Common Stock, Other [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 8,215
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Metals and Mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 21,989
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Agriculture [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 10,265
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 5,068
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Indices [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 2,506
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investments [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 317
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 298,504 | 3,988
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 298,504 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 3,988
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Government Obligations and Agencies [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 104,532 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Government Obligations and Agencies [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | 4,009
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 98,978 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-Backed and Asset-Backed Securities [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value | 94,994 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Non-Hedging Derivate Liability, Net [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  | (21)
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Cash and Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Restricted Cash and Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Government Obligations and Agencies [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Government Obligations and Agencies [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-Backed and Asset-Backed Securities [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Common Stock [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member] | Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Common Stock, Metals and Mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Common Stock, Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Common Stock, Other [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Metals and Mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Agriculture [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities, Exchange-Traded and Mutual Funds, Indices [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Non-Hedging Derivate Liability, Net [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investments [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment Owned, at Fair Value |  |

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column E -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph Column C -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column C -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column C.3,4) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column C.7) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column E.2,3) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.Column C.6) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column C -Article 12 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 3, 4 -Article 12 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph 2, 3 -Article 12 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph 6 -Article 12 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 7 -Article 12 + Details
Name: | us-gaap_InvestmentOwnedAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant