CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 25,435	$ 40,757
Accounts receivable, less allowance for doubtful accounts of $6,405 and $6,333, respectively	271,499	256,959
Other receivables	9,699	12,376
Inventories	9,601	9,638
Prepaid expenses and other	25,900	25,037
Costs and estimated earnings in excess of billings	33,842	26,204
Assets related to discontinued operations	1,257	1,582
Total current assets	377,233	372,553
PROPERTY AND EQUIPMENT, NET	41,496	41,416
GOODWILL	114,588	114,588
IDENTIFIABLE INTANGIBLE ASSETS, NET	42,586	44,515
OTHER NONCURRENT ASSETS	7,705	7,682
Total assets	583,608	580,754
CURRENT LIABILITIES:
Current maturities of long-term debt	300	300
Accounts payable	100,565	100,641
Accrued compensation and benefits	35,647	36,892
Billings in excess of costs and estimated earnings	75,284	73,814
Accrued self-insurance expense	30,284	29,096
Other current liabilities	27,704	27,077
Liabilities related to discontinued operations	439	767
Total current liabilities	270,223	268,587
LONG-TERM DEBT, NET OF CURRENT MATURITIES	2,100	2,100
NOTES TO FORMER OWNERS	5,000	5,000
DEFERRED INCOME TAX LIABILITIES	7,589	7,954
OTHER LONG-TERM LIABILITIES	9,920	9,807
Total liabilities	294,832	293,448
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par, 5,000,000 shares authorized, none issued and outstanding
Common stock, $.01 par, 102,969,912 shares authorized, 41,123,365 and 41,123,365 shares issued, respectively	411	411
Treasury stock, at cost, 3,889,635 and 3,879,299 shares, respectively	(41,143)	(41,012)
Additional paid-in capital	316,440	317,534
Retained earnings (deficit)	(3,996)	(6,528)
Comfort Systems USA, Inc. stockholders' equity	271,712	270,405
Noncontrolling interests	17,064	16,901
Total stockholders' equity	288,776	287,306
Total liabilities and stockholders' equity	$ 583,608	$ 580,754