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Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Other Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross Amount $ 145,423 $ 145,423
Finite-lived intangible assets, Accumulated Amortization (24,456) (10,635)
Finite-lived intangible assets, Net Carrying Value 120,967 134,788
Customer Relationships [Member]    
Other Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross Amount 144,123 144,123
Finite-lived intangible assets, Accumulated Amortization (23,517) (10,563)
Finite-lived intangible assets, Net Carrying Value $ 120,606 $ 133,560
Customer Relationships [Member] | Minimum [Member]    
Other Intangible Assets [Line Items]    
Intangible assets estimated useful life 5 years 5 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 $ 1,300
Finite-lived intangible assets, Accumulated Amortization (939) (72)
Finite-lived intangible assets, Net Carrying Value $ 361 $ 1,228
Intangible assets estimated useful life 18 months 18 months