Revisions in Estimates - Schedule of Projects Summarized (Details) - Downward Estimate Change [Member] - Large Project Construction [Member]	3 Months Ended
	Mar. 31, 2018 USD ($) project	Mar. 31, 2017 USD ($) project
Change In Accounting Estimate [Line Items]
Number of projects with downward estimate changes | project	2,000,000	5,000,000
Increase (decrease) on project profitability	$ (7,900,000)	$ (13,000,000)
Minimum [Member]
Change In Accounting Estimate [Line Items]
Range of increase (reduction) in gross profit from each project, net	(2,600,000)	(1,300,000)
Maximum [Member]
Change In Accounting Estimate [Line Items]
Range of increase (reduction) in gross profit from each project, net	$ (5,300,000)	$ (4,700,000)