Supplementary Balance Sheet Information - Contract Acquisition Costs, Net (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 231,472		$ 235,700
Amortization expense	55,167	$ 22,921
Conversion costs
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	141,525		144,173
Accumulated amortization	173,600		164,400
Amortization expense	8,173		7,157
Payments for processing rights
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	89,947		91,527
Accumulated amortization	149,000		145,300
Amortization expense	$ 5,219		$ 4,929