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Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 654,854 $ 637,570
Accumulated amortization (394,110) (357,609)
Net carrying amount 260,744 279,961
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross amount 343,276 344,175
Accumulated amortization (188,027) (168,134)
Net carrying amount $ 155,249 $ 176,041
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 $ 41,671 $ 41,594
Accumulated amortization (27,996) (25,241)
Net carrying amount $ 13,675 $ 16,353
Trademark | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life in years 2 years 2 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 $ 213,368 $ 195,262
Accumulated amortization (147,933) (136,907)
Net carrying amount $ 65,435 $ 58,355
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 (30,154) (27,327)
Net carrying amount $ 26,385 $ 29,212