Related Party Transactions - Related Party Transactions (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Unfunded Commitment	$ 63,795
Fair Value	389,728
J.C Flowers II L.P. [Member]
Related Party Transaction [Line Items]
Unfunded Commitment	2,218	2,220
Fair Value	21,972	22,458
J.C. Flowers III L.P. [Member]
Related Party Transaction [Line Items]
Unfunded Commitment	56,482	69,247
Fair Value	41,026	35,780
JCF III Co-Invest I L.P. [Member]
Related Party Transaction [Line Items]
Fair Value	22,922	23,334
New NIB Partners L.P. [Member]
Related Party Transaction [Line Items]
Fair Value	18,736	20,521
Varadero International Ltd [Member]
Related Party Transaction [Line Items]
Fair Value	52,322	24,395
Flowers Affiliates [Member]
Related Party Transaction [Line Items]
Unfunded Commitment	58,700	71,467
Fair Value	$ 156,978	$ 126,488

- Definition

This element represents the total fair market value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements, but may also be used in both the balance sheet and disclosure in the same submission. This item represents alternative investments as of the balance sheet date which may include investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds, and any other investment in which investee management calculates net asset value per share as the primary metric for investment value.

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