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Business and Organization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Business and Organization
Revenue	$ 385,942	$ 369,547
Percentage of revenue attributable to services	100.00%
Installation of systems in newly constructed facilities
Business and Organization
Percentage of revenue attributable to services	41.00%
Maintenance, repair and replacement services
Business and Organization
Percentage of revenue attributable to services	59.00%
HVAC
Business and Organization
Revenue	$ 289,456
Percentage of revenue attributable to services	75.00%
Plumbing
Business and Organization
Revenue	$ 54,032
Percentage of revenue attributable to services	14.00%
Building Automation Control Systems
Business and Organization
Revenue	$ 23,157
Percentage of revenue attributable to services	6.00%
Other
Business and Organization
Revenue	$ 19,297
Percentage of revenue attributable to services	5.00%

X

- Definition

The percentage of net services revenue to total net revenue from the services rendered as of the year end.

+ References

No definition available.

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X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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=26872669&loc=d3e20235-122688

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