Software and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 314,140	$ 311,749
Accumulated Amortization	(113,644)	(108,115)
Net Balance	200,496	203,634
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	298,038	295,730
Accumulated Amortization	(101,405)	(96,356)
Net Balance	196,633	199,374
Trademarks and tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,102	16,019
Accumulated Amortization	(12,239)	(11,759)
Net Balance	$ 3,863	$ 4,260