Amount of accounts receivable, net of billings in excess of costs, arising from transactions with related parties. Receivables are the amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Includes contract assets, net. Billings in excess of costs is the liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

No definition available.

Related Party Transactions (Management and Other Transactions) (Narrative) (Details) $ in Thousands	1 Months Ended	3 Months Ended		13 Months Ended
	Feb. 28, 2018 USD ($)	Mar. 31, 2019 USD ($) entity	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Distributions to non-controlling interests		$ 0	$ 559
Management [Member]
Related Party Transaction [Line Items]
Distributions to non-controlling interests			600
Management [Member] \| Lease Agreements [Member]
Related Party Transaction [Line Items]
Payments, related party		14,700	7,500
Payables, related party					$ 1,500
Management [Member] \| Service Agreements [Member]
Related Party Transaction [Line Items]
Payments, related party		13,800	9,000
Payables, related party		3,700		$ 3,700	15,800
Management [Member] \| Equipment [Member]
Related Party Transaction [Line Items]
Receivables, related party					200
Proceeds from collection, related party		200
Management [Member] \| Construction Contracts [Member]
Related Party Transaction [Line Items]
Revenue, related party		$ 300	$ 2,700
Number of entities \| entity		2
Accounts receivable, net of BIEC, related party		$ 200		200	100
Immediate Family Member of Management [Member] \| Construction Management Firm Specializing in Steel Building Systems [Member]
Related Party Transaction [Line Items]
Business combinations, cash paid (in dollars)	$ 6,100
Contingent consideration, earn-out liability, net		1,400		1,400
Business combinations, notes payable assumed	$ 2,600
Business combinations, interest payable on notes payable assumed		100		100
Repayments of notes payable and interest, related party				2,700
Advances outstanding, related party		$ 1,000		$ 1,000	$ 1,000