Commitments and Contingencies - Additional Information (Detail) (USD $)	6 Months Ended		6 Months Ended												6 Months Ended		3 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Pending Litigation [Member]	Jun. 30, 2014 Curtailment Obligation Liability [Member]	Nov. 01, 2012 Curtailment Obligation Liability [Member]	Jun. 30, 2014 Representations And Warranties [Member]	Jun. 30, 2014 Reverse Mortgage [Member] Additional Borrowing Capacity Floating Rate Reverse Mortgage Loans [Member]	Jun. 30, 2014 Reverse Mortgage [Member] Additional Borrowing Capacity Fixed Rate Reverse Mortgage Loans [Member]	Jun. 30, 2014 Reverse Mortgage [Member] Commitment to Lend [Member]	Jun. 30, 2014 Reverse Mortgage [Member] Loan Purchase Commitments [Member]	Jun. 30, 2014 Reverse Mortgage [Member] Loan Sale Commitments [Member]	Jun. 30, 2014 Originations [Member] Commitment to Lend [Member]	Jun. 30, 2014 Originations [Member] Loan Purchase Commitments [Member]	Jun. 30, 2014 Originations [Member] Commitment To Sell Securities [Member]	Jun. 30, 2014 Originations [Member] Commitment to Purchase Mortgage Backed Securities [Member]	Jun. 30, 2014 VIE [Member] trust	Jun. 30, 2014 VIE Primary Beneficiary [Member] Non-Residual Trusts [Member]	Jun. 30, 2014 Charged Off Loans [Member] Loan Purchase Commitments [Member]
Loss Contingencies [Line Items]
Additional amount of potential loss exposure from similar claims			$ 120,700,000
Reimbursement obligation of LOC, if drawn															165,000,000
Expected period to exercise mandatory clean-up call obligation																2017 and continuing through 2019
Aggregate number of securitization trusts consolidated and not consolidated with reimbursement obligations															11
Amount of LOCs available for eleven securitization trusts															268,600,000
Outstanding balance of collateral for mandatory clean-up call obligation																417,900,000
Commitments to sell loans						903,800,000	2,000,000	78,900,000		98,000,000	3,400,000,000		3,900,000,000	504,700,000
Commitments to purchase loans									7,000,000			11,600,000					7,000,000
Notification period required for non-renewal																	60 days
Mandatory repurchase obligation			60,400,000	46,000,000	10,300,000
Range of reasonably possible losses, minimum		0
Range of reasonably possible losses, maximum		6,000,000
Loss contingency recorded in current period			800,000
Loss contingency associated with prior servicer			$ 5,200,000
Tax separation agreement date	Apr. 17, 2009
Income tax examination, period of letters issued to prior parent for proposed changes in specified tax years	30 days