CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
REVENUE	$ 329,410	$ 282,059
COST OF SERVICES	286,666	247,850
Gross profit	42,744	34,209
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	46,363	42,622
GAIN ON SALE OF ASSETS	(216)	(85)
Operating loss	(3,403)	(8,328)
OTHER INCOME (EXPENSE):
Interest income	4	26
Interest expense	(397)	(487)
Changes in the fair value of contingent earn-out obligations	(30)	(95)
Other	52	15
Other income (expense)	(371)	(541)
LOSS BEFORE INCOME TAXES	(3,774)	(8,869)
INCOME TAX BENEFIT	(1,106)	(3,699)
NET LOSS INCLUDING NONCONTROLLING INTERESTS	(2,668)	(5,170)
Less: Net loss attributable to noncontrolling interests	(1,639)
NET LOSS ATTRIBUTABLE TO COMFORT SYSTEMS USA, INC.	$ (1,029)	$ (5,170)
LOSS PER SHARE ATTRIBUTBALE TO COMFORT SYSTEMS USA, INC.:
Basic (in dollars per share)	$ (0.03)	$ (0.14)
Diluted (in dollars per share)	$ (0.03)	$ (0.14)
SHARES USED IN COMPUTING LOSS PER SHARE:
Basic (in shares)	37,056	37,537
Diluted (in shares)	37,056	37,537
DIVIDENDS PER SHARE (in dollars per share)	$ 0.050	$ 0.050