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Fair Value Disclosures - Schedule of Fair Value Measurements of Investments in Certain Entities that Calculate Net Asset Value Per Share (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Other investments, at fair value | $ 38,323 | $ 42,772
Other Investment Vehicles [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Other investments, at fair value | 35,057 | 42,261
Other Investment Vehicles [Member] | EuroDekania [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Other investments, at fair value | 2,054 | 2,370
Redemption Frequency | N/A | N/A
Redemption Notice Period | N/A | N/A
Other Investment Vehicles [Member] | Star Asia [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Other investments, at fair value | 30,169 | 37,358
Redemption Frequency | N/A | N/A
Redemption Notice Period | N/A | N/A
Other Investment Vehicles [Member] | Tiptree [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Other investments, at fair value | 2,834 | 2,533
Redemption Frequency | N/A | N/A
Redemption Notice Period | N/A | N/A
Investment Funds [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Other investments, at fair value | 2,503 |
Investment Funds [Member] | Star Asia Special Situations Fund [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Other investments, at fair value | 2,503 |
Unfunded Commitments | 321 |
Redemption Frequency | N/A |
Redemption Notice Period | N/A |
Other Investment Vehicles and Investment Funds [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Other investments, at fair value | $ 37,560 |

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- Definition Other investments represent investments (other than investments-trading) owned that were accounted for at fair value with unrealized and realized gains and losses recorded in the statement of operations. + References No definition available. + Details
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- Definition States the frequency (for example, annually, semi-annually, quarterly) with which the entity can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=SL6742756-110258 + Details
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- Definition States the notice requirement (for example, 30 to 60 days) the entity is required to deliver before it can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=SL6742756-110258 + Details
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- Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=SL6742756-110258 + Details
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