SERVICING - (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Servicing
Purchased servicing portfolio loans final unpaid principal balance	$ 63,081,154	$ 59,121,989	$ 57,321,824	$ 51,040,752	$ 50,212,264	$ 47,794,561	$ 47,713,739	$ 46,066,660	$ 44,031,890
Loans serviced
Servicing
Purchased servicing portfolio loans final unpaid principal balance	63,100,000				50,200,000
Custodial escrow accounts	1,600,000				$ 1,100,000
HUD Loan Portfolio Acquired
Servicing
Purchased servicing portfolio loans final unpaid principal balance	$ 3,600,000