Business and Organization (Details)	3 Months Ended
	Mar. 31, 2014
Installation of systems in newly constructed facilities
Business and Organization
Percentage of revenue attributable to services	48.00%
Maintenance, repair and replacement services
Business and Organization
Percentage of revenue attributable to services	52.00%
HVAC
Business and Organization
Percentage of revenue attributable to services	76.00%
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	5.00%