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Financial Instruments - Variable Interest Entities (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Variable Interest Entity [Line Items] |  |
Total VIE Assets | $ 2,035,329 | $ 2,039,347
Carrying Value of Variable Interest Assets | 360 | 404
Carrying Value of Variable Interest Liabilities |  |
Capital Commitments | 8 | 8
Maximum Exposure to Loss in Non- consolidated VIEs | 368 | 412
Hedge Funds [Member] |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 1,923,636 | 1,868,178
Carrying Value of Variable Interest Assets | 328 | 372
Carrying Value of Variable Interest Liabilities |  |
Maximum Exposure to Loss in Non- consolidated VIEs | 328 | 372
Private Equity Funds [Member] |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 111,693 | 171,169
Carrying Value of Variable Interest Assets | 32 | 32
Carrying Value of Variable Interest Liabilities |  |
Capital Commitments | 8 | 8
Maximum Exposure to Loss in Non- consolidated VIEs | $ 40 | $ 40

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- Definition The amount of unfunded capital for which the entity is obligated, to those certain investments for which net asset value per share is calculated. + References No definition available. + Details
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- Definition Variable interest entity assets. + References No definition available. + Details
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- Definition Difference between the carrying amount of assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the variable interest entity (VIE) and the reporting entity's maximum exposure to loss as a result of its involvement with the VIE, where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 + Details
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- Details
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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 + Details
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- Definition Carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 + Details
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