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Fair Value Measurements - Assets Accounted for at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Owned, at Fair Value	$ 474,315	$ 469,747
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Owned, at Fair Value	474,315	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	354,440
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	117,275	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	104,215
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	94,203
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	91,000
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	9,295
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	55,727
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	184,897	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	65,022
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	117,275	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	9,295
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	55,727
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	289,418	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	289,418
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	104,215
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	94,203
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	91,000
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)

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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

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 13

-Paragraph Column C

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

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-Subparagraph (SX 210.12-12.Column C.3,4)

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SX 210.12-12C.Column C.7)

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

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-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

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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

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