Business and Organization (Details)	9 Months Ended
	Sep. 30, 2015
Installation of systems in newly constructed facilities
Business and Organization
Percentage of revenue attributable to services	46.00%
Maintenance, repair and replacement services
Business and Organization
Percentage of revenue attributable to services	54.00%
HVAC
Business and Organization
Percentage of revenue attributable to services	77.00%
Plumbing
Business and Organization
Percentage of revenue attributable to services	14.00%
Building automation control systems
Business and Organization
Percentage of revenue attributable to services	5.00%
Other
Business and Organization
Percentage of revenue attributable to services	4.00%