Software and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 342,352	$ 349,184
Accumulated Amortization	(102,825)	(87,748)
Net Balance	239,527	261,436
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	315,577	322,216
Accumulated Amortization	(81,736)	(68,616)
Net Balance	233,841	253,600
Trademarks and tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,631	15,767
Accumulated Amortization	(9,945)	(7,946)
Net Balance	5,686	7,821
Purchased contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,727	10,768
Accumulated Amortization	(10,727)	(10,768)
Covenant not to compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	417	433
Accumulated Amortization	$ (417)	(418)
Net Balance		$ 15