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Contracts with Customers - Summary of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Billed	$ 494,366	$ 538,808
Unbilled	218,959	135,180
Total accounts receivable, gross	713,325	673,988
Allowance for doubtful accounts	(41,833)	(50,702)
Total accounts receivable, net	$ 671,492	$ 623,286

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