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Revenue - Total Receivables (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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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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