Software and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 327,714	$ 364,805
Accumulated Amortization	(110,061)	(107,880)
Net Balance	217,653	256,925
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	300,784	336,075
Accumulated Amortization	(88,801)	(86,585)
Net Balance	211,983	249,490
Trademarks and tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,387	18,040
Accumulated Amortization	(10,717)	(10,605)
Net Balance	5,670	7,435
Purchased contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,543	10,690
Accumulated Amortization	$ (10,543)	$ (10,690)