Goodwill and Intangible Assets - Classes of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Cost		$ 159,887
Indefinite-lived intangible assets, cost	$ 13,447
Accumulated Amortization	29,784	19,858
Net	113,193	140,029
Total intangible assets, gross (excluding goodwill)	156,424
Intangible assets, net	126,640	140,029
Trade Names
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, cost		14,559
Trade Names
Finite-Lived Intangible Assets [Line Items]
Cost	3,679	3,675
Accumulated Amortization	3,679	3,042
Net	$ 0	$ 633
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Amortization period	24 months	24 months
Cost	$ 27	$ 27
Accumulated Amortization	27	18
Net	$ 0	$ 9
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Amortization period	180 months	180 months
Cost	$ 139,271	$ 141,626
Accumulated Amortization	26,078	16,798
Net	$ 113,193	$ 124,828
Minimum | Trade Names
Finite-Lived Intangible Assets [Line Items]
Amortization period	12 months	12 months
Maximum | Trade Names
Finite-Lived Intangible Assets [Line Items]
Amortization period	24 months	24 months