Fair Value - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities Required to be Disclosed at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Financial assets
Cash and cash equivalents	$ 303,341	$ 491,885	$ 532,620	$ 442,054
Restricted cash and cash equivalents	811,670	804,803
Residential loans at amortized cost, net (includes $11,930 and $14,320 in allowance for loan losses at June 30, 2014 and December 31, 2013, respectively)	1,361,153	1,394,871
Insurance premium receivables	100,527	103,149
Servicer and protective advances net (includes $79,972 and $52,238 in allowance for uncollectible advances at June 30, 2014 and December 31, 2013, respectively)	1,595,950	1,381,434
Financial liabilities
Payables to insurance carriers	79,551	69,489
Servicer payables	735,391	735,225
Servicing advance liabilities	1,040,441	971,286
Warehouse borrowings	1,151,216	1,085,563
Debt	2,269,590	2,272,085
Mortgage-backed debt carried at amortized cost	1,803,470	1,887,862
Carrying Amount [Member] | Level 1 [Member]
Financial assets
Cash and cash equivalents	303,341	491,885
Restricted cash and cash equivalents	811,670	804,803
Financial liabilities
Servicer payables	735,391	735,225
Carrying Amount [Member] | Level 3 [Member]
Financial assets
Residential loans at amortized cost, net (includes $11,930 and $14,320 in allowance for loan losses at June 30, 2014 and December 31, 2013, respectively)	1,361,153	1,394,871
Insurance premium receivables	100,527	103,149
Servicer and protective advances net (includes $79,972 and $52,238 in allowance for uncollectible advances at June 30, 2014 and December 31, 2013, respectively)	1,595,950	1,381,434
Financial liabilities
Payables to insurance carriers	79,551	69,489
Servicing advance liabilities	1,035,485	970,884
Mortgage-backed debt carried at amortized cost	1,139,250	1,189,536
Carrying Amount [Member] | Level 2 [Member]
Financial liabilities
Warehouse borrowings	1,147,935	1,084,112
Debt	2,229,854	2,229,969
Estimated Fair Value [Member] | Level 1 [Member]
Financial assets
Cash and cash equivalents	303,341	491,885
Restricted cash and cash equivalents	811,670	804,803
Financial liabilities
Servicer payables	735,391	735,225
Estimated Fair Value [Member] | Level 3 [Member]
Financial assets
Residential loans at amortized cost, net (includes $11,930 and $14,320 in allowance for loan losses at June 30, 2014 and December 31, 2013, respectively)	1,309,382	1,341,376
Insurance premium receivables	95,904	97,902
Servicer and protective advances net (includes $79,972 and $52,238 in allowance for uncollectible advances at June 30, 2014 and December 31, 2013, respectively)	1,543,203	1,332,315
Financial liabilities
Payables to insurance carriers	78,544	68,470
Servicing advance liabilities	1,040,441	971,286
Mortgage-backed debt carried at amortized cost	1,138,758	1,192,510
Estimated Fair Value [Member] | Level 2 [Member]
Financial liabilities
Warehouse borrowings	1,151,216	1,085,563
Debt	$ 2,324,221	$ 2,322,709