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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	$ 191,043	$ 156,724
Less: accumulated depreciation and amortization	(109,968)	(88,936)
Property Plant And Equipment Net	81,075	67,788
Land [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	66	66
Building [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	218	218
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	6,152	5,235
Furniture, Fixtures and Equipment[Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	30,863	26,344
Vehicles and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	$ 153,744	$ 124,861

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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-SubTopic 10
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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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