Variable Interest Entities - Additional Information (Detail) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Asset-backed securities issued by securitization trusts	[1]	$ 474,285	$ 539,651
Variable Interest Entities Primary Beneficiary
Variable Interest Entity [Line Items]
Asset-backed securities issued by securitization trusts		$ 474,300	$ 539,700

[1] The consolidated balance sheets include assets of consolidated variable interest entities, or 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 September 30, 2019 and December 31, 2018, total assets of the consolidated VIEs were $485 million and $551 million (including accrued interest receivable of $1.6 million and $1.8 million), respectively (which is recorded above in the line item entitled “Interest receivable”), and total liabilities were $476 million and $541 million (including accrued interest payable of $1.6 million and $1.7 million), respectively (which is recorded in the line item above entitled “Accrued interest payable”). Please refer to Note 5, “Variable Interest Entities,” for further discussion.