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Prepaid Expenses and Other Assets - Summary of Prepaid Expenses and Other Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Prepaid Expense and Other Assets [Abstract] |  |
Revenues in excess of billings | $ 7,987 | $ 4,841
Prepaid expenses | 3,390 | 7,494
Contract retainage | 2,469 | 1,449
Income tax receivable | 471 | 2,230
Other | 1,245 | 864
Total prepaid expenses and other assets | $ 15,562 | $ 16,878

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- Definition Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract to be collected in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49370-109356 + Details
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