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Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross Amount $ 145,423  
Finite-lived intangible assets, Accumulated Amortization (10,635)  
Finite-lived intangible assets, Net Carrying Value 134,788  
Customer Relationships [Member]    
Other Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross Amount 144,123 $ 71,581
Finite-lived intangible assets, Accumulated Amortization (10,563) (6,834)
Finite-lived intangible assets, Net Carrying Value $ 133,560 $ 64,747
Customer Relationships [Member] | Minimum [Member]    
Other Intangible Assets [Line Items]    
Intangible assets estimated useful life 5 years 7 years
Customer Relationships [Member] | Maximum [Member]    
Other Intangible Assets [Line Items]    
Intangible assets estimated useful life 15 years 15 years
Trade Name [Member]    
Other Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross Amount $ 1,300  
Finite-lived intangible assets, Accumulated Amortization (72)  
Finite-lived intangible assets, Net Carrying Value $ 1,228  
Intangible assets estimated useful life 18 months