Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 355,252	$ 348,711
Accumulated depreciation	(230,652)	(225,960)
Property and equipment, net	124,600	122,751
Buildings and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 88,781	81,065
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	$ 88,667	91,720
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	$ 166,178	164,161
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	$ 11,626	$ 11,765
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