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Revenue - Receivables and Concentration of Credit Risk (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Accounts, Notes, Loans and Financing Receivable, Net, Current [Abstract] |  |
Billed Receivables | $ 175,066 | $ 240,137
Allowance for doubtful accounts | (4,001) | (4,799)
Billed Receivables, net | 171,065 | 235,338
Accrued receivables | 328,546 | 27,507
Significant financing component | (34,109) |
Total accrued receivables, net | 294,437 | 27,507
Less current accrued receivables | 117,276 | 27,507
Less current significant financing component | (9,972) |
Total long-term accrued receivables, net | 187,133 |
Total receivables, net | $ 465,502 | $ 262,845

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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