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	Dec. 31, 2014	Dec. 31, 2013
Financial assets
Residential loans at amortized cost, net	$ 1,314,539us-gaap_LoansReceivableNet	$ 1,394,871us-gaap_LoansReceivableNet
Insurance premium receivables	98,220us-gaap_PremiumsReceivableGross	103,149us-gaap_PremiumsReceivableGross
Servicer and protective advances, net	1,761,082wac_ServicerAndProtectiveAdvancesNet	1,381,434wac_ServicerAndProtectiveAdvancesNet
Financial liabilities
Payables to insurance carriers	69,498wac_PayablesToInsuranceCarriers	69,489wac_PayablesToInsuranceCarriers
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
Carrying Amount [Member] \| Level 3 [Member]
Financial assets
Residential loans at amortized cost, net	1,314,539	1,394,871
Insurance premium receivables	98,220	103,149
Servicer and protective advances, net	1,761,082	1,381,434
Financial liabilities
Payables to insurance carriers	69,498	69,489
Servicing advance liabilities	1,362,017	970,884
Mortgage-backed debt	1,086,660	1,189,536
Carrying Amount [Member] \| Level 2 [Member]
Financial liabilities
Corporate debt	2,230,557	2,229,969
Estimate of Fair Value Measurement [Member] \| Level 3 [Member]
Financial assets
Residential loans at amortized cost, net	1,377,213	1,341,376
Insurance premium receivables	93,395	97,902
Servicer and protective advances, net	1,691,443	1,332,315
Financial liabilities
Payables to insurance carriers	68,673	68,470
Servicing advance liabilities	1,367,519	971,286
Mortgage-backed debt	1,121,369	1,192,510
Estimate of Fair Value Measurement [Member] \| Level 2 [Member]
Financial liabilities
Corporate debt	$ 2,095,286	$ 2,322,709

Obligation reflecting another party's right to economic interests in another entity or trust under a contractual right. For example, an investor may purchase a beneficial interest in a securitization transaction.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15)

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- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

Gross amount, as of the balance sheet date, due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, before deducting the allowance for doubtful accounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.5)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

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- Definition

Carrying value as of the balance sheet date of other collateralized debt obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

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-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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- Definition

Payables to insurance carriers.

+ References

No definition available.

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- Definition

Servicer and protective advances, net.

+ References

No definition available.

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