Contract Receivables, Net - Summary of Contract Receivables, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Billed and billable	$ 235,431	$ 264,682
Allowance for doubtful accounts	(5,154)	(3,506)
Contract receivables, net	$ 230,277	$ 261,176

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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