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Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 161,724	$ 158,901
Less: accumulated depreciation and amortization	(118,749)	(108,747)
Property and equipment, net	42,975	50,154
Transportation Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	48,645	48,645
Computer Equipment And Purchased Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	61,299	58,920
Furniture and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,460	10,464
Leaseholds Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	31,403	31,023
Internally Developed Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,917	$ 9,849

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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