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Subsequent Events (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		0 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jul. 29, 2011 Carrier's HVAC/R [Member]	Jun. 30, 2011 Carrier's HVAC/R [Member]	Dec. 31, 2010 Carrier's HVAC/R [Member]	Jun. 30, 2011 Carrier Enterprise Northeast [Member]	Apr. 29, 2011 Carrier Enterprise Northeast [Member]	Jun. 30, 2011 Carrier [Member]
Revolving credit agreement maximum borrowing capacity	$ 125,000		$ 125,000
Purchase date of joint venture					July 29, 2011
Controlling interest, percent ownership	60.00%		60.00%		60.00%			60.00%		60.00%
Cash consideration					9,000				35,700
Revenues	$ 883,548	$ 864,805	$ 1,417,887	$ 1,374,560			$ 75,000
Number of locations						6
Number of employees					90

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Amount of cash paid to acquire the entity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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