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Revenue - Receivables and Concentration of Credit Risk (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Net, Current [Abstract]
Billed Receivables	$ 168,921	$ 240,137
Allowance for doubtful accounts	(3,459)	(4,799)
Billed Receivables, net	165,462	235,338
Accrued receivables	319,476	27,507
Significant financing component	(31,549)
Total accrued receivables, net	287,927	27,507
Less current accrued receivables	117,323	27,507
Less current significant financing component	(9,593)
Total long-term accrued receivables, net	180,197
Total receivables, net	$ 453,389	$ 262,845

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Amount, after accumulated amortization, of the financing component related to unbilled receivable balances.

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Amount, after accumulated amortization, of the financing component related to unbilled receivable balances due within one year of the balance sheet date.

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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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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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