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Quarterly Results of Operations - Summary of Company's Unaudited Consolidated Results of Operations on Quarterly Basis (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Data [Abstract]                      
Total revenues $ 317,492,000us-gaap_Revenues $ 386,000,000us-gaap_Revenues $ 413,713,000us-gaap_Revenues $ 369,948,000us-gaap_Revenues $ 402,839,000us-gaap_Revenues $ 489,167,000us-gaap_Revenues $ 595,964,000us-gaap_Revenues $ 314,529,000us-gaap_Revenues $ 1,487,153,000us-gaap_Revenues $ 1,802,499,000us-gaap_Revenues $ 623,807,000us-gaap_Revenues
Total expenses 429,855,000us-gaap_CostsAndExpenses 389,523,000us-gaap_CostsAndExpenses 467,171,000us-gaap_CostsAndExpenses 338,480,000us-gaap_CostsAndExpenses 382,604,000us-gaap_CostsAndExpenses 374,856,000us-gaap_CostsAndExpenses 359,049,000us-gaap_CostsAndExpenses 266,744,000us-gaap_CostsAndExpenses 1,625,029,000us-gaap_CostsAndExpenses 1,383,253,000us-gaap_CostsAndExpenses 617,900,000us-gaap_CostsAndExpenses
Other gains (losses) 3,303,000wac_OtherGainsLosses 16,204,000wac_OtherGainsLosses 1,532,000wac_OtherGainsLosses (2,503,000)wac_OtherGainsLosses (13,330,000)wac_OtherGainsLosses 6,507,000wac_OtherGainsLosses 1,656,000wac_OtherGainsLosses (1,261,000)wac_OtherGainsLosses 18,536,000wac_OtherGainsLosses (6,428,000)wac_OtherGainsLosses (41,358,000)wac_OtherGainsLosses
Income (loss) before income taxes (109,060,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 12,681,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (51,926,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 28,965,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 6,905,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 120,818,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 238,571,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 46,524,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (119,340,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 412,818,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (35,451,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense (benefit) (65,087,000)us-gaap_IncomeTaxExpenseBenefit 83,484,000us-gaap_IncomeTaxExpenseBenefit (38,997,000)us-gaap_IncomeTaxExpenseBenefit 11,588,000us-gaap_IncomeTaxExpenseBenefit (2,892,000)us-gaap_IncomeTaxExpenseBenefit 48,129,000us-gaap_IncomeTaxExpenseBenefit 95,339,000us-gaap_IncomeTaxExpenseBenefit 18,775,000us-gaap_IncomeTaxExpenseBenefit (9,012,000)us-gaap_IncomeTaxExpenseBenefit 159,351,000us-gaap_IncomeTaxExpenseBenefit (13,317,000)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) (43,973,000)us-gaap_NetIncomeLoss (70,803,000)us-gaap_NetIncomeLoss (12,929,000)us-gaap_NetIncomeLoss 17,377,000us-gaap_NetIncomeLoss 9,797,000us-gaap_NetIncomeLoss 72,689,000us-gaap_NetIncomeLoss 143,232,000us-gaap_NetIncomeLoss 27,749,000us-gaap_NetIncomeLoss (110,328,000)us-gaap_NetIncomeLoss 253,467,000us-gaap_NetIncomeLoss (22,134,000)us-gaap_NetIncomeLoss
Basic earnings (loss) per common and common equivalent share (in usd per share) $ (1.17)us-gaap_EarningsPerShareBasic $ (1.88)us-gaap_EarningsPerShareBasic $ (0.34)us-gaap_EarningsPerShareBasic $ 0.46us-gaap_EarningsPerShareBasic $ 0.26us-gaap_EarningsPerShareBasic $ 1.93us-gaap_EarningsPerShareBasic $ 3.82us-gaap_EarningsPerShareBasic $ 0.74us-gaap_EarningsPerShareBasic $ (2.93)us-gaap_EarningsPerShareBasic $ 6.75us-gaap_EarningsPerShareBasic $ (0.73)us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per common and common equivalent share (in usd per share) $ (1.17)us-gaap_EarningsPerShareDiluted $ (1.88)us-gaap_EarningsPerShareDiluted $ (0.34)us-gaap_EarningsPerShareDiluted $ 0.45us-gaap_EarningsPerShareDiluted $ 0.26us-gaap_EarningsPerShareDiluted $ 1.90us-gaap_EarningsPerShareDiluted $ 3.75us-gaap_EarningsPerShareDiluted $ 0.73us-gaap_EarningsPerShareDiluted $ (2.93)us-gaap_EarningsPerShareDiluted $ 6.63us-gaap_EarningsPerShareDiluted $ (0.73)us-gaap_EarningsPerShareDiluted
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions                 (124,471,000)us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions 153,331,000us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions  
Legal Fees 50,400,000us-gaap_LegalFees                    
Provision for uncollectible advances 34,300,000us-gaap_ProvisionForDoubtfulAccounts               75,704,000us-gaap_ProvisionForDoubtfulAccounts 37,993,000us-gaap_ProvisionForDoubtfulAccounts 13,199,000us-gaap_ProvisionForDoubtfulAccounts
Asset Management Performance Fees Collected   2,500,000wac_PerformanceFeesEarnedinConnectionwithEquityMethodInvestment 34,200,000wac_PerformanceFeesEarnedinConnectionwithEquityMethodInvestment           36,800,000wac_PerformanceFeesEarnedinConnectionwithEquityMethodInvestment    
Goodwill Impairment     82,269,000us-gaap_GoodwillImpairmentLoss           82,269,000us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Losses on extinguishments         $ 12,500,000us-gaap_GainsLossesOnExtinguishmentOfDebt       $ 0us-gaap_GainsLossesOnExtinguishmentOfDebt $ (12,489,000)us-gaap_GainsLossesOnExtinguishmentOfDebt $ (48,579,000)us-gaap_GainsLossesOnExtinguishmentOfDebt