Payables and Accrued Liabilities - Payables and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable and accrued liabilities	$ 117,716	$ 174,659
Curtailment liability	102,201	60,776
Employee-related liabilities	68,542	93,368
Payables to insurance carriers	74,832	69,498
Originations liability	64,013	45,370
Servicing rights and related advance purchases payable	43,602	77,231
Derivative instruments	13,753	30,024
Accrued interest payable	10,486	13,808
Uncertain tax positions	14,463	14,914
Acquisition related escrow funds payable to sellers	10,236	10,236
Servicing transfer payables	4,897	9,592
Margin payable on derivative instruments	30,032	2,780
Other	68,095	61,573
Total payables and accrued liabilities	$ 622,868	$ 663,829