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) - Variable Interest Entities [Member] - Successor [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Variable Interest Entities [Line Items]
Loans, Estimated fair value	$ 13,005,216	$ 12,371,177
Long-term debt, Estimated fair value	13,595,792	12,882,076
Loans, Unpaid principal balance	10,181,689	10,236,695
Long-term debt, Unpaid principal balance	$ 11,888,598	$ 11,925,499