Software and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 322,178	$ 364,805
Accumulated Amortization	(118,544)	(107,880)
Net Balance	203,634	256,925
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	295,730	336,075
Accumulated Amortization	(96,356)	(86,585)
Net Balance	199,374	249,490
Trademarks and tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,019	18,040
Accumulated Amortization	(11,759)	(10,605)
Net Balance	4,260	7,435
Purchased contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,429	10,690
Accumulated Amortization	$ (10,429)	$ (10,690)