Weighted Average Useful Life for Each Component of Contract Acquisition Costs (Detail) (Contract Acquisition Costs)	12 Months Ended
	Dec. 31, 2014
Finite-Lived Intangible Assets And Liabilities [Line Items]
Weighted Average Amortization Period (Yrs)	13 years 4 months 24 days
Payments for processing rights
Finite-Lived Intangible Assets And Liabilities [Line Items]
Weighted Average Amortization Period (Yrs)	14 years 6 months
Conversion costs
Finite-Lived Intangible Assets And Liabilities [Line Items]
Weighted Average Amortization Period (Yrs)	12 years 3 months 18 days