Commitments and Contingencies - Additional Information (Detail)		6 Months Ended
	Oct. 14, 2014 USD ($) subsidiary	Jun. 30, 2016 USD ($)
Loss Contingencies [Line Items]
Material reserves for litigation		$ 0
Purchase price of receivable portfolios		1,200,000,000
Purchase price		$ 195,500,000
Brent v. Midland Credit Management [Member]
Loss Contingencies [Line Items]
Number of defendant subsidiaries | subsidiary	2
Settlement fund, paid	$ 5,200,000
Settlement maximum (not to exceed)	$ 5,700,000.0