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Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 154,739	$ 157,790
Less: accumulated depreciation and amortization	(101,380)	(100,354)
Property and equipment, net	53,359	57,436
Transportation Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	48,645	48,835
Computer Equipment And Purchased Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	57,515	60,692
Furniture and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,425	10,871
Leaseholds Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	28,511	27,737
Internally Developed Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,643	$ 9,655

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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+ References

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