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Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 611,373 $ 607,211
Accumulated amortization (320,154) (308,092)
Net carrying amount 291,219 299,119
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross amount 334,455 334,455
Accumulated amortization (148,295) (141,829)
Net carrying amount $ 186,160 $ 192,626
Customer relationships | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life in years 8 years 8 years
Customer relationships | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life in years 14 years 14 years
Trademark    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 39,950 $ 39,950
Accumulated amortization (22,516) (21,650)
Net carrying amount $ 17,434 $ 18,300
Trademark | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life in years 10 years 10 years
Trademark | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life in years 15 years 15 years
Software packages    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 180,429 $ 176,267
Accumulated amortization (124,843) (121,055)
Net carrying amount $ 55,586 $ 55,212
Software packages | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life in years 3 years 3 years
Software packages | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life in years 10 years 10 years
Non-compete agreement    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life in years 15 years 15 years
Gross amount $ 56,539 $ 56,539
Accumulated amortization (24,500) (23,558)
Net carrying amount $ 32,039 $ 32,981