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Property and Equipment, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Accumulated depreciation	$ (227,776)	$ (204,533)
Property and equipment, net	109,238	91,849
Buildings and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 71,698	54,348
Buildings and Leasehold Improvements | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives (years)	1 year
Buildings and Leasehold Improvements | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives (years)	15 years
Furniture and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 85,322	81,705
Furniture and Equipment | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives (years)	3 years
Furniture and Equipment | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives (years)	10 years
Computer Systems and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 168,241	148,255
Computer Systems and Equipment | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives (years)	3 years
Computer Systems and Equipment | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives (years)	10 years
Construction Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 11,753	$ 12,074
Construction Equipment | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives (years)	5 years
Construction Equipment | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives (years)	7 years

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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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.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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