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Prepaid Expenses and Other Assets - Summary of Prepaid Expenses and Other Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Prepaid Expense and Other Assets [Abstract] |  |
Prepaid expenses | $ 5,385 | $ 3,390
Revenues in excess of billings | 4,850 | 7,987
Contract retainage | 2,426 | 2,469
Income tax receivable | 291 | 471
Other | 302 | 1,245
Total prepaid expenses and other assets | $ 13,254 | $ 15,562

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