Variable Interest Entities - Additional Information (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Asset-backed securities issued by securitization trusts	[1]	$ 857,965	$ 915,486
Variable Interest Entities Primary Beneficiary
Variable Interest Entity [Line Items]
Asset-backed securities issued by securitization trusts		$ 857,965	$ 915,486

[1] The consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations and liabilities of the VIEs for which creditors do not have recourse to the Company. At March 31, 2016 and December 31, 2015, total assets of the consolidated VIEs were $915 million and $972 million, respectively, and total liabilities were $861 million and $918 million, respectively. Please refer to Note 4, “Variable Interest Entities,” for further discussion.