Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	May 19, 2008 Subsidiary	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 17, 2010 ClassAction	Nov. 02, 2010 ClassAction
Contingencies And Commitments [Line Items]
Number of defendant subsidiaries	2
Payment of settlement awards, fees and costs		$ 5,200,000
Number of class actions filed					2	2
Attorneys' fees and costs awarded to plaintiffs		550,000
Material reserves for litigation		0
Rent expense		12,000,000	6,900,000	5,800,000
Purchase price of receivable portfolios		770,100,000
Purchase price		93,500,000
Purchase commitments in past one year		0
Estimated fair value, liability		0
Minimum [Member]
Contingencies And Commitments [Line Items]
Damages sought by plaintiffs	25,000
Maximum [Member]
Contingencies And Commitments [Line Items]
Total settlement amount		$ 5,700,000