CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
REVENUE	$ 1,331,185	$ 1,216,654	$ 1,063,520
COST OF SERVICES	1,123,564	1,035,124	873,589
Gross profit	207,621	181,530	189,931
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	185,809	167,053	159,016
GOODWILL IMPAIRMENT		57,354
GAIN ON SALE OF ASSETS	(491)	(236)	(527)
Operating income (loss)	22,303	(42,641)	31,442
OTHER INCOME (EXPENSE):
Interest income	24	128	193
Interest expense	(1,595)	(1,886)	(1,699)
Changes in the fair value of contingent earn-out obligations	662	5,528	1,574
Other	145	934	247
Other income (expense)	(764)	4,704	315
INCOME (LOSS) BEFORE INCOME TAXES	21,539	(37,937)	31,757
INCOME TAX EXPENSE (BENEFIT)	10,045	(5,463)	11,193
INCOME (LOSS) FROM CONTINUING OPERATIONS	11,494	(32,474)	20,564
DISCONTINUED OPERATIONS:
Operating income (loss), net of income tax expense (benefit) of $212, $(2,709) and $(4,833)	355	(4,018)	(6,547)
Gain (loss) on disposition of discontinued operations, net of income tax expense of $-, $- and $(166)			723
NET INCOME (LOSS) INCLUDING NONCONTROLLING INTERESTS	11,849	(36,492)	14,740
Less: Net income (loss) attributable to noncontrolling interests	(1,614)	338
NET INCOME (LOSS) ATTRIBUTABLE TO COMFORT SYSTEMS USA, INC	13,463	(36,830)	14,740
OTHER COMPREHENSIVE INCOME:
Realized gain on marketable securities reclassified into earnings, net of income taxes			181
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO COMFORT SYSTEMS USA, INC.	$ 13,463	$ (36,830)	$ 14,921
Basic-
Income (loss) from continuing operations (in dollars per share)	$ 0.35	$ (0.88)	$ 0.54
Discontinued operations-
Income (loss) from operations (in dollars per share)	$ 0.01	$ (0.11)	$ (0.17)
Gain (loss) on disposition (in dollars per share)			$ 0.02
Net income (loss) (in dollars per share)	$ 0.36	$ (0.99)	$ 0.39
Diluted-
Income (loss) from continuing operations (in dollars per share)	$ 0.35	$ (0.88)	$ 0.54
Discontinued operations-
Income (loss) from operations (in dollars per share)	$ 0.01	$ (0.11)	$ (0.17)
Gain (loss) on disposition (in dollars per share)			$ 0.02
Net income (loss) (in dollars per share)	$ 0.36	$ (0.99)	$ 0.39
SHARES USED IN COMPUTING INCOME (LOSS) PER SHARE:
Basic (in shares)	37,112	37,389	37,549
Diluted (in shares)	37,259	37,389	37,790
DIVIDENDS PER SHARE (in dollars per share)	$ 0.200	$ 0.200	$ 0.200