Transfers of Residential Loans - Schedule of Servicing Arrangements Associated with Transfers of Forward Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Residential Loan Transfers Line Items
Servicing Rights, Net	$ 1,648,544	$ 1,304,900
Servicer and protective advances net (includes $79,972 and $52,238 in allowance for uncollectible advances at June 30, 2014 and December 31, 2013, respectively)	1,595,950	1,381,434
Receivables, net (includes $36,181 and $43,545 at fair value at June 30, 2014 and December 31, 2013, respectively)	288,829	319,195
Total assets	18,385,950	17,387,529
Servicing Arrangements Associated with Transfers of Forward Loans [Member]
Residential Loan Transfers Line Items
Servicing Rights, Net	258,544	192,962
Servicer and protective advances net (includes $79,972 and $52,238 in allowance for uncollectible advances at June 30, 2014 and December 31, 2013, respectively)	3,365	6,023
Receivables, net (includes $36,181 and $43,545 at fair value at June 30, 2014 and December 31, 2013, respectively)	668	437
Total assets	262,577	199,422
Unpaid Principal Balance of Transferred Loans	$ 21,272,121	$ 14,672,986