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Variable Interest Entities - Summary of Carrying Amounts of Assets and Liabilities Related to Variable Interests (Parenthetical) (Detail) (VIE [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
VIE [Member]
  
Variable Interest Entity [Line Items]  
Reimbursement obligation of LOC, if drawn $ 165.0wac_ReimbursementObligationOfLocIfDrawn
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= wac_VariableInterestEntitiesMember