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Commitments And Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Commitments and Contingencies [Line Items]
Commitment to purchase alternative investment	$ 50,000
Funded commitment amount	26,500
Future Funding Commitments	25,955	$ 22,500
Unfunded Commitments | Equity Fund, LP
Commitments and Contingencies [Line Items]
Future Funding Commitments	2,400
Unfunded Commitments | European Non-Performing Loan Fund, LP
Commitments and Contingencies [Line Items]
Future Funding Commitments	$ 23,600

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- Definition

Commitment To Purchase Alternative Investment

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No definition available.

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- Definition

Commitments And Contingencies [Line Items]

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- Definition

Funded Commitment Amount

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- Definition

Future Funding Commitments

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No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

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Period Type:

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- Details

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