Business and Organization (Details)	6 Months Ended
	Jun. 30, 2013
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
Percentage of revenue attributable to services	75.00%
Plumbing
Business and Organization
Percentage of revenue attributable to services	15.00%
Building automation control systems
Business and Organization
Percentage of revenue attributable to services	6.00%
Other
Business and Organization
Percentage of revenue attributable to services	4.00%