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Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 155,663	$ 154,739
Less: accumulated depreciation and amortization	(103,744)	(101,380)
Property and equipment, net	51,919	53,359
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	56,933	57,515
Furniture and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,709	10,425
Leaseholds Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	29,733	28,511
Internally Developed Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,643	$ 9,643

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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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