Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average collateral severity rate	21.00%	37.00%
Period of receivables sold in multiple transactions	15 months
Minimum period to update carrying values for real estate owned properties	45 days
Other Income [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Negative impact to lower of amortized cost or fair value	$ 110