Acquisitions - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified		1 Months Ended	9 Months Ended		1 Months Ended			1 Months Ended
	Sep. 30, 2013	Jul. 02, 2012 Carrier Enterprise I	Sep. 30, 2013 Carrier Enterprise I	Jul. 01, 2009 Carrier Enterprise I	Jul. 30, 2011 Carrier Enterprise II Location	Sep. 30, 2013 Carrier Enterprise II	Apr. 30, 2011 Carrier Enterprise II Location	Apr. 27, 2012 Carrier Enterprise III Location	Apr. 27, 2012 Carrier Enterprise III Customer Relationships	Apr. 27, 2012 UTC Canada
Business Acquisition [Line Items]
Controlling interest		70.00%		60.00%	60.00%	60.00%		60.00%
Non-controlling interest, ownership percentage	40.00%			40.00%	40.00%			40.00%
Option to acquire interests, percentage			10.00%	10.00%
Percentage of additional ownership acquired		10.00%
Cash consideration		$ 51,881						$ 80,489
Option to purchase additional interest, date			2014-07-01
Number of locations contributed to joint venture by non-controlling interest							28	35
Number of locations contributed to joint venture by controlling interest					14
Number of locations					7
Shares issued to UTC Canada Corporation, an affiliate of Carrier Corporation										1,250,000
Fair value of shares issued to UTC Canada Corporation										93,250
Goodwill and intangibles, purchase price allocation								216,463
Percent of tax basis of acquired goodwill amortized at a rate of 7%								75.00%
Goodwill amortization rate								7.00%
Fair value of acquired intangible assets								151,172
Finite-lived intangible assets, average useful life, in years									15 years
Identified intangible assets, customer relationships									55,657
Identified intangible assets, trade names and distribution rights								95,515
Purchase price								$ 173,739