XML 201 R41.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Concentration of Risk and Enterprise Wide Disclosures (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Segment Reporting [Abstract] |
Schedule of Revenue by Major Customers by Reporting Segments | The following table shows contract revenues generated from the Company’s customers that accounted for more than 10% of consolidated revenues (amounts in thousands):
| Years Ended December 31,
| 2018 |  | 2017 |  | 2016
| Amount |  | % |  | Amount |  | % |  | Amount |  | %
Utah Department of Transportation (“UDOT”) | $ | 153,276 |  |  | 14.8 | % |  | $ | 140,529 |  |  | 14.7 | % |  | $ | 79,421 |  |  | 11.5 | %
Texas Department of Transportation (“TXDOT”) | * |  |  | * |  |  | 103,236 |  |  | 10.8 | % |  | 85,224 |  |  | 12.4 | %
California Department of Transportation (“Caltrans”) | * |  |  | * |  |  | * |  |  | * |  |  | $ | 88,627 |  |  | 12.8 | %
*Represents less than 10% of revenues

X
- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration