Segments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information
General contracting and real estate services revenues	$ 41,201	$ 38,552	$ 161,391	$ 108,555
General contracting and real estate services expenses	39,377	37,274	154,588	104,336
Non-cash stock compensation			1,047	864
General and Administrative Expense
Segment Reporting Information
Non-cash stock compensation	200	100	800	600
General contracting and real estate services \| Maximum
Segment Reporting Information
Non-cash stock compensation	100	100	200	400
General contracting and real estate services \| Intersegment Eliminations
Segment Reporting Information
General contracting and real estate services revenues	13,900	7,900	31,300	40,700
General contracting and real estate services expenses	$ 13,700	$ 7,700	$ 31,000	$ 40,200

Amount of expense incurred related to general contracting and real estate services.

No definition available.

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- Definition

The aggregate revenue from real estate operations during the reporting period.

+ 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(e))
-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.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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