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Concentration of Risk and Enterprise Wide Disclosures - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Revenue, Major Customer [Line Items] |  |
Receivables, including retainage | $ 133,931 | $ 84,132
Customer Concentration Risk | Accounts Receivable | Texas Department of Transportation (“TXDOT”) |  |
Revenue, Major Customer [Line Items] |  |
Receivables, including retainage |  | $ 7,900

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- Definition Amount to be collected within one year of the balance sheet date (or one operating cycle, if longer) from customers in accordance with the contractual provisions of long-term contracts or programs including amounts billed and unbilled as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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