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Revenue - Receivables and Concentration of Credit Risk (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Accounts, Notes, Loans and Financing Receivable, Net, Current [Abstract] |  |  |  |
Billed receivables | $ 239,275 | $ 240,137 |  |
Allowance for doubtful accounts | (3,912) | (4,799) | $ (3,873) | $ (5,045)
Billed receivables, net | 235,363 | 235,338 |  |
Accrued receivables | 336,858 | 27,507 |  |
Significant financing component | (35,029) |  |  |
Total accrued receivables, net | 301,829 | 27,507 |  |
Less current accrued receivables | 123,053 | 27,507 |  |
Less current significant financing component | (10,234) |  |  |
Total long-term accrued receivables, net | 189,010 |  |  |
Total receivables, net | $ 537,192 | $ 262,845 |  |

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