Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 159,217	$ 161,724
Less: accumulated depreciation and amortization	(122,630)	(118,749)
Property and equipment, net	36,587	42,975
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	61,793	61,299
Furniture and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,990	10,460
Leaseholds Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	28,872	31,403
Internally Developed Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,917	$ 9,917

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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