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Concentration of Risk and Enterprise Wide Disclosures - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
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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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

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