Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties.

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Beneficial interest at fair value.

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Excess Servicing Spread

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Home equity conversion mortgage backed security related obligations.

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Fair Value - Summary of Assets and Liabilities in Each Level of Fair Value Hierarchy (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Jan. 01, 2013	Dec. 31, 2012
Assets
Mortgage loans held for sale	$ 11,832,630,000	$ 10,341,375,000
Freestanding derivative instruments (IRLCs)	68,151,000	62,365,000
Receivables related to Non-Residual Trusts	25,201,000	43,545,000
Servicing rights carried at fair value	1,599,541,000us-gaap_ServicingAssetAtFairValueAmount	1,131,124,000us-gaap_ServicingAssetAtFairValueAmount	26,382,000us-gaap_ServicingAssetAtFairValueAmount	0us-gaap_ServicingAssetAtFairValueAmount
Liabilities
Contingent earn-out payments	0	5,900,000
Freestanding derivative instruments (IRLCs)	30,024,000	5,882,000
Excess servicing spread liability	66,311,000wac_ExcessServicingSpreadLiability	0wac_ExcessServicingSpreadLiability
Mortgage-backed debt related to Non-Residual Trusts	653,167,000wac_BeneficialInterestAtFairValue	684,778,000wac_BeneficialInterestAtFairValue
HMBS related obligations	9,951,895,000	8,652,746,000
Reverse Loans [Member]
Assets
Mortgage loans held for sale	10,064,365,000	8,738,503,000
Mortgage Loans Held for Sale [Member]
Assets
Mortgage loans held for sale	1,124,615,000	1,015,607,000
Mortgage Loans related to Non-Residual Trusts [Member]
Assets
Mortgage loans held for sale	586,433,000	587,265,000
Charged Off Loans [Member]
Assets
Mortgage loans held for sale	57,217,000	0
Level 1 [Member]
Liabilities
Contingent earn-out payments	0	5,900,000
Liabilities, Fair Value	0	5,900,000
Level 2 [Member]
Assets
Freestanding derivative instruments (IRLCs)	7,751,000	19,534,000
Assets, Fair Value	1,132,366,000	1,035,141,000
Liabilities
Freestanding derivative instruments (IRLCs)	29,761,000	2,127,000
Liabilities, Fair Value	29,761,000	2,127,000
Level 2 [Member] \| Mortgage Loans Held for Sale [Member]
Assets
Mortgage loans held for sale	1,124,615,000	1,015,607,000
Level 3 [Member]
Assets
Freestanding derivative instruments (IRLCs)	60,400,000	42,831,000
Receivables related to Non-Residual Trusts	25,201,000	43,545,000
Servicing rights carried at fair value	1,599,541,000	1,131,124,000
Assets, Fair Value	12,393,157,000	10,543,268,000
Liabilities
Freestanding derivative instruments (IRLCs)	263,000	3,755,000
Excess servicing spread liability	66,311,000	0
Mortgage-backed debt related to Non-Residual Trusts	653,167,000	684,778,000
HMBS related obligations	9,951,895,000	8,652,746,000
Liabilities, Fair Value	10,671,636,000	9,341,279,000
Level 3 [Member] \| Reverse Loans [Member]
Assets
Mortgage loans held for sale	10,064,365,000	8,738,503,000
Level 3 [Member] \| Mortgage Loans related to Non-Residual Trusts [Member]
Assets
Mortgage loans held for sale	586,433,000	587,265,000
Level 3 [Member] \| Charged Off Loans [Member]
Assets
Mortgage loans held for sale	$ 57,217,000	$ 0