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Condensed Consolidated Financial Statements - Receivables and Concentration of Credit Risk (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Accounting Policies [Abstract] |  |
Billed Receivables | $ 139,671 | $ 192,045
Allowance for doubtful accounts | (3,829) | (5,045)
Billed, net | 135,842 | 187,000
Accrued Receivables | 23,567 | 32,116
Receivables, net | $ 159,409 | $ 219,116

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