Variable Interest Entities - Summary of Carrying Amounts of Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Restricted cash and cash equivalents	$ 837,628	$ 733,015
Residential loans at amortized cost, net	1,288,898us-gaap_LoansReceivableNet	1,314,539us-gaap_LoansReceivableNet
Residential loans at fair value	12,204,837	11,832,630
Receivables at fair value	248,378us-gaap_AccountsReceivableNet	215,629us-gaap_AccountsReceivableNet
Servicer and protective advances, net	1,612,988wac_ServicerAndProtectiveAdvancesNet	1,761,082wac_ServicerAndProtectiveAdvancesNet
Other assets	292,078us-gaap_OtherAssets	280,794us-gaap_OtherAssets
Total assets	19,308,167us-gaap_Assets	18,991,977us-gaap_Assets
Liabilities
Payables and accrued liabilities	669,313	663,829
Servicing advance liabilities	1,284,804us-gaap_SecuredDebtOther	1,365,885us-gaap_SecuredDebtOther
Mortgage-backed debt	1,706,367us-gaap_BeneficialInterest	1,751,459us-gaap_BeneficialInterest
Total liabilities	18,259,206us-gaap_Liabilities	17,915,318us-gaap_Liabilities
VIE Primary Beneficiary [Member]
ASSETS
Restricted cash and cash equivalents	103,092	105,977
Residential loans at amortized cost, net	1,268,109	1,292,781
Residential loans at fair value	567,912	586,433
Receivables at fair value	22,935	25,201
Servicer and protective advances, net	1,194,718	1,273,186
Other assets	42,329	46,199
Total assets	3,199,095	3,329,777
Liabilities
Payables and accrued liabilities	8,348	8,511
Servicing advance liabilities	1,090,692	1,160,257
Mortgage-backed debt	1,706,367	1,751,459
Total liabilities	2,805,407	2,920,227
Residual Trusts [Member] \| VIE Primary Beneficiary [Member]
ASSETS
Restricted cash and cash equivalents	42,612	41,632
Residential loans at amortized cost, net	1,268,109	1,292,781
Residential loans at fair value	0	0
Receivables at fair value	0	0
Servicer and protective advances, net	0	0
Other assets	38,605	41,758
Total assets	1,349,326	1,376,171
Liabilities
Payables and accrued liabilities	7,242	7,590
Servicing advance liabilities	0	0
Mortgage-backed debt	1,071,128	1,098,292
Total liabilities	1,078,370	1,105,882
Non-Residual Trusts [Member] \| VIE Primary Beneficiary [Member]
ASSETS
Restricted cash and cash equivalents	12,928	12,710
Residential loans at amortized cost, net	0	0
Residential loans at fair value	567,912	586,433
Receivables at fair value	22,935	25,201
Servicer and protective advances, net	0	0
Other assets	1,144	1,023
Total assets	604,919	625,367
Liabilities
Payables and accrued liabilities	0	0
Servicing advance liabilities	0	0
Mortgage-backed debt	635,239	653,167
Total liabilities	635,239	653,167
Servicer and Protective Advance Financing [Member] \| VIE Primary Beneficiary [Member]
ASSETS
Restricted cash and cash equivalents	47,552	51,635
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	1,194,718	1,273,186
Other assets	2,580	3,418
Total assets	1,244,850	1,328,239
Liabilities
Payables and accrued liabilities	1,106	921
Servicing advance liabilities	1,090,692	1,160,257
Mortgage-backed debt	0	0
Total liabilities	$ 1,091,798	$ 1,161,178

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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