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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Net intangible assets $ 184,468 $ 82,511
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 199,265 118,223
Accumulated amortization (54,757) (38,429)
Net intangible assets $ 144,508 $ 79,794
Weighted average useful life 11 years 14 years
Other Intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets $ 43,537 $ 4,045
Accumulated amortization (3,577) (1,328)
Net intangible assets $ 39,960 $ 2,717
Weighted average useful life 7 years 5 years