Variable Interest Entities - Summary of Carrying Amounts of Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Restricted cash and cash equivalents	$ 733,015	$ 804,803
Residential loans at amortized cost, net	1,314,539us-gaap_LoansReceivableNet	1,394,871us-gaap_LoansReceivableNet
Residential loans at fair value	11,832,630	10,341,375
Receivables at fair value	215,629us-gaap_AccountsReceivableNet	319,195us-gaap_AccountsReceivableNet
Servicer and protective advances, net	1,761,082wac_ServicerAndProtectiveAdvancesNet	1,381,434wac_ServicerAndProtectiveAdvancesNet
Other assets	280,794us-gaap_OtherAssets	413,076us-gaap_OtherAssets
Total assets	18,991,977us-gaap_Assets	17,387,529us-gaap_Assets
Liabilities
Payables and accrued liabilities	663,829	494,139
Servicing advance liabilities	1,365,885us-gaap_SecuredDebtOther	971,286us-gaap_SecuredDebtOther
Mortgage-backed debt	1,751,459us-gaap_BeneficialInterest	1,887,862us-gaap_BeneficialInterest
Total liabilities	17,915,318us-gaap_Liabilities	16,220,513us-gaap_Liabilities
VIE Primary Beneficiary [Member]
ASSETS
Restricted cash and cash equivalents	105,977	59,080
Residential loans at amortized cost, net	1,292,781	1,377,711
Residential loans at fair value	586,433	587,265
Receivables at fair value	25,201	43,545
Servicer and protective advances, net	1,273,186	75,481
Other assets	46,199	56,254
Total assets	3,329,777	2,199,336
Liabilities
Payables and accrued liabilities	8,511	8,472
Servicing advance liabilities	1,160,257	67,905
Mortgage-backed debt	1,751,459	1,887,862
Total liabilities	2,920,227	1,964,239
Residual Trusts [Member] \| VIE Primary Beneficiary [Member]
ASSETS
Restricted cash and cash equivalents	41,632	44,995
Residential loans at amortized cost, net	1,292,781	1,377,711
Residential loans at fair value	0	0
Receivables at fair value	0	0
Servicer and protective advances, net	0	0
Other assets	41,758	54,544
Total assets	1,376,171	1,477,250
Liabilities
Payables and accrued liabilities	7,590	8,391
Servicing advance liabilities	0	0
Mortgage-backed debt	1,098,292	1,203,084
Total liabilities	1,105,882	1,211,475
Non Residual Trusts [Member] \| VIE Primary Beneficiary [Member]
ASSETS
Restricted cash and cash equivalents	12,710	13,086
Residential loans at amortized cost, net	0	0
Residential loans at fair value	586,433	587,265
Receivables at fair value	25,201	43,545
Servicer and protective advances, net	0	0
Other assets	1,023	1,302
Total assets	625,367	645,198
Liabilities
Payables and accrued liabilities	0	0
Servicing advance liabilities	0	0
Mortgage-backed debt	653,167	684,778
Total liabilities	653,167	684,778
Servicer and Protective Advance Financing Facilities [Member] \| VIE Primary Beneficiary [Member]
ASSETS
Restricted cash and cash equivalents	51,635	999
Residential loans at amortized cost, net	0	0
Residential loans at fair value	0	0
Receivables at fair value	0	0
Servicer and protective advances, net	1,273,186	75,481
Other assets	3,418	408
Total assets	1,328,239	76,888
Liabilities
Payables and accrued liabilities	921	81
Servicing advance liabilities	1,160,257	67,905
Mortgage-backed debt	0	0
Total liabilities	$ 1,161,178	$ 67,986

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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