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Software and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 327,674 $ 364,805
Accumulated Amortization (115,281) (107,880)
Net Balance 212,393 256,925
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 300,826 336,075
Accumulated Amortization (93,392) (86,585)
Net Balance 207,434 249,490
Trademarks and tradenames [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 16,345 18,040
Accumulated Amortization (11,386) (10,605)
Net Balance 4,959 7,435
Purchased contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,503 10,690
Accumulated Amortization $ (10,503) $ (10,690)