Fair Value - Reconciliation of Beginning and Ending Balances of Company's Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Parenthetical) (Detail) (USD $)	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Loans Receivable Held-for-sale, Amount	$ 1,173,588,000	$ 630,456,000	$ 1,015,607,000	$ 1,664,215,000	$ 278,474,000	$ 45,065,000
Reverse Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Loans Receivable Held-for-sale, Amount			$ 28,500,000	$ 0