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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 30 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2014
Jun. 30, 2011
Jun. 28, 2010
Income Tax Disclosure [Line Items]                                  
Income tax expense (benefit) $ (38,997,000)us-gaap_IncomeTaxExpenseBenefit $ (2,892,000)us-gaap_IncomeTaxExpenseBenefit $ 48,129,000us-gaap_IncomeTaxExpenseBenefit $ 95,339,000us-gaap_IncomeTaxExpenseBenefit $ 18,775,000us-gaap_IncomeTaxExpenseBenefit $ (20,953,000)us-gaap_IncomeTaxExpenseBenefit $ 4,164,000us-gaap_IncomeTaxExpenseBenefit $ 347,000us-gaap_IncomeTaxExpenseBenefit $ 3,125,000us-gaap_IncomeTaxExpenseBenefit $ (27,409,000)us-gaap_IncomeTaxExpenseBenefit $ 114,114,000us-gaap_IncomeTaxExpenseBenefit $ 159,351,000us-gaap_IncomeTaxExpenseBenefit $ (13,317,000)us-gaap_IncomeTaxExpenseBenefit $ 60,264,000us-gaap_IncomeTaxExpenseBenefit      
Net operating loss carryforwards   8,900,000us-gaap_OperatingLossCarryforwards                   8,900,000us-gaap_OperatingLossCarryforwards          
Tax separation agreement date                   Apr. 17, 2009   Apr. 17, 2009          
Income tax examination, period of letters issued to prior parent for proposed changes in specified tax years                   30 days   30 days          
Excise tax contested                                 4,200,000wac_ExciseTaxContested
Income tax expense                       700,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 1,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense      
Accrued interest and penalties   8,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued       8,800,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued           8,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 8,800,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued        
Unrecognized tax benefits   $ 6,100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate       $ 7,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate           $ 6,100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate $ 7,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate        
Effective Income Tax Rate Reconciliation, Percent                   119.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations              
Tax provision at statutory tax rate of 35%                   35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate   35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate      
Scenario, Forecast [Member]                                  
Income Tax Disclosure [Line Items]                                  
Effective Income Tax Rate Reconciliation, Percent                             119.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		    
Minimum [Member]                                  
Income Tax Disclosure [Line Items]                                  
Percentage of taxable income required to be distributed while operating as REIT                               90.00%wac_PercentageOfTaxableIncomeRequiredToBeDistributedWhileOperatingAsReit
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Operating loss carryforwards expiration period starting year                       Dec. 31, 2028          
Minimum [Member] | IRS [Member]                                  
Income Tax Disclosure [Line Items]                                  
Income tax examination start year                       2010          
Minimum [Member] | States [Member]                                  
Income Tax Disclosure [Line Items]                                  
Income tax examination start year                       1998          
Maximum [Member]                                  
Income Tax Disclosure [Line Items]                                  
Operating loss carryforwards expiration period starting year                       Dec. 31, 2031          
Maximum [Member] | IRS [Member]                                  
Income Tax Disclosure [Line Items]                                  
Income tax examination start year                       2013          
Maximum [Member] | States [Member]                                  
Income Tax Disclosure [Line Items]                                  
Income tax examination start year                       2013