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	Dec. 31, 2015	Dec. 31, 2014
Variable Interest Entities [Line Items]
Loans, Unpaid principal balance	$ 6,205	$ 6,936
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	14,259,776	15,085,685
Variable Interest Entities [Member] | Successor [Member]
Variable Interest Entities [Line Items]
Loans, Estimated fair value	11,690,324	12,371,177
Long-term debt, Estimated fair value	12,327,960	12,882,076
Loans, Unpaid principal balance	9,182,284	10,236,695
Long-term debt, Unpaid principal balance	$ 11,069,070	$ 11,925,499