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Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 29, 2017
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 348,711	$ 296,382
Less: Accumulated depreciation	(225,960)	(204,533)
Property and equipment, net	122,751	91,849	$ 87,578
Buildings and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 81,065	54,348
Buildings and Leasehold Improvements | Minimum
Property Plant And Equipment [Line Items]
Useful lives (years)	1 year
Buildings and Leasehold Improvements | Maximum
Property Plant And Equipment [Line Items]
Useful lives (years)	15 years
Furniture and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 91,720	81,705
Furniture and Equipment | Minimum
Property Plant And Equipment [Line Items]
Useful lives (years)	3 years
Furniture and Equipment | Maximum
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	$ 164,161	148,255
Computer Systems and Equipment | Minimum
Property Plant And Equipment [Line Items]
Useful lives (years)	3 years
Computer Systems and Equipment | Maximum
Property Plant And Equipment [Line Items]
Useful lives (years)	10 years
Construction Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 11,765	$ 12,074
Construction Equipment | Minimum
Property Plant And Equipment [Line Items]
Useful lives (years)	5 years
Construction Equipment | Maximum
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.

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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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