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Business and Organization (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business and Organization
Revenue, Net	$ 383,840	$ 410,565	$ 416,567	$ 369,547	$ 356,468	$ 370,145	$ 362,801	$ 321,381	$ 1,580,519	$ 1,410,795	$ 1,357,272
Percentage of revenue attributable to services									100.00%
Installation of systems in newly constructed facilities
Business and Organization
Percentage of revenue attributable to services									44.00%
Maintenance, repair and replacement services
Business and Organization
Percentage of revenue attributable to services									56.00%
HVAC
Business and Organization
Revenue, Net									$ 1,216,999
Percentage of revenue attributable to services									77.00%
Plumbing
Business and Organization
Revenue, Net									$ 221,273
Percentage of revenue attributable to services									14.00%
Building automation control systems
Business and Organization
Revenue, Net									$ 79,026
Percentage of revenue attributable to services									5.00%
Other
Business and Organization
Revenue, Net									$ 63,221
Percentage of revenue attributable to services									4.00%

X

- Definition

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

+ References

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- 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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