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Accounts Receivable - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount billed but not received under retainage provisions in contracts | $ 900 | $ 2,500 |
Retainage receivables on contracts minimum period | 1 year |  |
Retainage receivables on contracts maximum period | 2 years |  |
Provision for doubtful accounts | $ 1,357 | 3,895 | $ 848
Charge-offs | 800 | 1,500 | $ 300
Allowance for doubtful accounts | 2,897 | $ 4,156 |
Contract Receivables [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Divestitures impacted amount on contract receivables | 22,200 |  |
Allowance for doubtful accounts | $ 1,200 |  |

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- Definition Retainage receivables on contracts maximum period. + References No definition available. + Details
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- Definition Retainage receivables on contracts minimum period. + References No definition available. + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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