Special Purpose Entities, Including Variable Interest Entities - Supplemental Information about Loans Held as Assets and Long-Term Debt Associated with Consolidated Variable Interest Entities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entities [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	$ 13,506,799	$ 14,259,776
Variable Interest Entities [Member] | Successor [Member]
Variable Interest Entities [Line Items]
Loans, Estimated fair value	11,074,772	11,690,324
Long-term debt, Estimated fair value	11,444,892	12,327,960
Loans, Unpaid principal balance	8,252,444	9,182,284
Long-term debt, Unpaid principal balance	$ 9,543,681	$ 10,803,729