Significant Accounting Policies - Additional Information (Detail) (USD $)	0 Months Ended		6 Months Ended
	Apr. 30, 2014	Apr. 29, 2014	Jun. 30, 2014	Jun. 30, 2013	Apr. 30, 2014 entity	Dec. 31, 2013
Accounting Policies [Abstract]
Number of legally separate publicly traded entities					2
Number of shares issued for each share prior to spin-off					1
Beginning Equity balance post-Spin-Off					$ 1,710,000,000
Preferred stock value outstanding					565,000,000
Special cash contribution from Spin Off			472,718,000	0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum days past due that company may required spin-off company to purchase loans			90 days
Period of hardship forbearance			6 months
Split loans held			7,436,225,000			6,506,642,000
Loss confirmation period	1 year	2 years
Amount of change in allowance due to policy change			14,000,000
Deferred taxes payable			323,467,000		283,000,000	162,205,000
Indemnification receivable					264,000,000
Tax indemnification receivable			270,198,000		291,000,000	0
Liability for uncertain tax positions, current			20,000,000		27,000,000
Deferred tax and uncertain tax positions liability			303,000,000		310,000,000
Deferred tax liability			283,000,000		283,000,000
Deferred tax assets			250,000,000		310,000,000
Deferred tax asset discount			20,000,000		19,000,000
Split Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Split loans held			$ 1,300,000,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan delinquency period	60 days	150 days
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan delinquency period	120 days	212 days