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Fair Value Disclosures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 3 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Investments-trading [Member] | Dec. 31, 2011 Investments-trading [Member] | Dec. 31, 2012 Equity warrants [Member] | Mar. 31, 2011 U.S. government agency MBS [Member] | Dec. 31, 2011 RMBS [Member] | Sep. 30, 2011 RMBS [Member] | Dec. 31, 2011 RMBS [Member] Investments-trading [Member] | Dec. 31, 2012 Star Asia [Member] | Dec. 31, 2011 Star Asia [Member] | Dec. 31, 2012 Residential Loan [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Equity warrants [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value, option, changes in fair value, gains (losses) | $ (6,284) | $ 1,504 | $ 24,813 |  |  |  |  |  |  |  |  |  |  |
Discount rate used in determining fair value of Star Asia |  |  |  |  |  |  |  |  |  |  | 6.82% | 7.50% |  |
Unadjusted net asset value of Star Asia Finance | 39,998 | 46,031 |  |  |  |  |  |  |  |  |  |  |  |
Company's international valuation model of Star Asia value | 30,169 | 37,358 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of assets transfers out of level 3 |  |  |  | 57 | 2,080 | 57 |  | 2,080 |  | 2,080 |  |  | 267 | 91
Fair value of net assets transfers into level 3 |  |  |  |  | 10,066 |  |  |  |  |  |  |  |  |
Fair value of assets transfers into level 3 |  | $ 12,146 |  |  | $ 12,146 |  | $ 4,332 |  | $ 7,814 | $ 7,814 |  |  |  |

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- Definition Fair value derived from internal valuation model. + References No definition available. + Details
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- Definition Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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