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Financial instruments - Variable Interest Entities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Variable Interest Entity [Line Items] |  |
Total VIE Assets | $ 2,039,347 | $ 1,810,783
Carrying Value of Variable Interest Assets | 404 | 420
Carrying Value of Variable Interest Liabilities |  |
Capital Commitments | 8 | 13
Maximum Exposure to Loss in Non- consolidated VIEs | 412 | 433
Hedge Funds [Member] |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 1,868,178 | 1,668,508
Carrying Value of Variable Interest Assets | 372 | 393
Carrying Value of Variable Interest Liabilities |  |
Capital Commitments |  |
Maximum Exposure to Loss in Non- consolidated VIEs | 372 | 393
Private Equity Funds [Member] |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 171,169 | 142,275
Carrying Value of Variable Interest Assets | 32 | 27
Carrying Value of Variable Interest Liabilities |  |
Capital Commitments | 8 | 13
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-Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph C6 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: 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=7880789&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=7880789&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=7880789&loc=d3e5728-111685 + Details
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