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Revenue - Total Receivables (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable, Net, Current [Abstract]
Billed receivables	$ 158,807	$ 239,275
Allowance for doubtful accounts	(3,663)	(3,912)
Billed receivables, net	155,144	235,363
Accrued receivables	320,575	336,858
Significant financing component	(32,562)	(35,029)
Total accrued receivables, net	288,013	301,829
Less current accrued receivables	120,569	123,053
Less current significant financing component	(9,963)	(10,234)
Total long-term accrued receivables, net	177,407	189,010
Total receivables, net	$ 443,157	$ 537,192

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The amount of unbilled receivable current.

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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