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Contracts with Customers - Summary of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Billed	$ 516,099	$ 538,808
Unbilled	200,477	135,180
Total accounts receivable, gross	716,576	673,988
Allowance for doubtful accounts	(42,902)	(50,702)
Total accounts receivable, net	$ 673,674	$ 623,286

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