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Revenue Recognition on Construction Contract and Other Service Revenues (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	$ 17,581	$ 23,138	$ 44,779	$ 36,172
Construction
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	16,668	21,078	42,583	31,169
Design
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	655	1,826	1,719	4,539
Other
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	258	234	477	464
GMP
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	9,539	18,317	30,025	24,906
FFP
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	6,288	4,587	12,723	10,785
Cost-plus fee
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	1,496	0	1,554	17
Other
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	$ 258	$ 234	$ 477	$ 464

X

- Definition

Amount of revenue earned from products sold or services provided under the terms of a contract, including, but not limited to, government contracts and construction contracts, classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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