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Acquisitions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended						9 Months Ended			0 Months Ended	1 Months Ended	9 Months Ended		12 Months Ended
	Apr. 29, 2011	Sep. 30, 2011	Sep. 30, 2011 Noncontrolling Interest [Member]	Apr. 29, 2011 Noncontrolling Interest [Member]	Apr. 29, 2011 Difference Between Fair Value And Carrying Value [Member]	Apr. 30, 2010 Tennessee [Member]	Sep. 30, 2011 Carrier Enterprise Northeast [Member] Customer Relationships [Member]	Apr. 29, 2011 Carrier Enterprise Northeast [Member] Customer Relationships [Member]	Apr. 29, 2011 Carrier Enterprise Northeast [Member] Trade Names And Distribution Rights [Member]	Apr. 29, 2011 Carrier Enterprise Northeast [Member]	Apr. 29, 2011 Carrier Enterprise Northeast [Member]	Sep. 30, 2011 Carrier Enterprise Northeast [Member]	Sep. 30, 2011 Carrier Enterprise Mexico [Member]	Dec. 31, 2010 Carrier Enterprise Mexico [Member]	Jul. 29, 2011 Carrier Enterprise Mexico [Member]	Sep. 30, 2011 Carrier [Member]	Apr. 29, 2011 Carrier [Member]
Business Acquisition [Line Items]
Controlling interest		60.00%								60.00%	60.00%	60.00%			60.00%	60.00%
Cash consideration						$ 2,406				$ 35,700	$ 35,700				$ 9,000
Revenues														75,000
Number of locations acquired													7
Number of locations contributed to joint venture by controlling interest																	28
Number of locations contributed to joint venture by controlling interest	14									14
Entity Number of Employees														90
Consideration for contribution of 14 locations in joint venture		14,769	7,708	7,708	7,061							14,769
Approximate net working capital adjustment included in final purchase price												1,240
Goodwill and intangibles, purchase price allocation										32,957	32,957
Fair value of acquired intangible assets										20,600	20,600
Identified intangible assets, trade names and distribution rights									13,400
Identified intangible assets, customer relationships								7,200
Finite-lived intangible assets, average useful life							12
Period available for tax deductions related to acquired goodwill (in years)											15
Purchase price	$ 49,229									$ 49,229	$ 49,229
Ownership percentage by noncontrolling owners		40.00%		40.00%	40.00%

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