Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Product	$ 288,452	$ 209,202	$ 765,334	$ 708,408
Service	36,402	29,800	95,737	86,727
Other	32,894	38,850	108,617	126,525
Total revenues	357,748	277,852	969,688	921,660
Expenses:
Costs of products sold, exclusive of depreciation and amortization shown below	255,554	189,830	680,632	651,283
Operating	52,360	52,367	162,813	172,750
General and administrative	20,952	16,680	54,887	53,073
Depreciation and amortization	16,113	12,081	41,563	35,687
Loss (gain) on disposal of long-lived assets, net	408	(3,615)	(130)	(3,496)
Total expenses	345,387	267,343	939,765	909,297
Earnings from equity method investments	7,483	3,116	39,689	22,903
Operating income	19,844	13,625	69,612	35,266
Other expenses (income):
Interest expense	9,080	1,992	15,971	7,763
Foreign currency transaction (gain) loss	(457)	355	(973)	358
Other expense, net	4,671	9,354	36,771	16,783
Total other expenses, net	13,294	11,701	51,769	24,904
Income (loss) from continuing operations before income taxes	6,550	1,924	17,843	10,362
Income tax expense (benefit)	3,413	2,091	(41,305)	985
Income (loss) from continuing operations	3,137	(167)	59,148	9,377
Income (loss) from discontinued operations, net of income taxes	(2)	(265)	65	(456)
Net income (loss)	3,135	(432)	59,213	8,921
Less: net income attributable to noncontrolling interests	5,054	2,336	14,429	7,915
Net income (loss) attributable to SemGroup	(1,919)	(2,768)	44,784	1,006
Other comprehensive income (loss), net of income taxes	6,105	12,072	(4,307)	14,930
Comprehensive income (loss)	9,240	11,640	54,906	23,851
Less: comprehensive income attributable to noncontrolling interests	5,054	2,336	14,429	7,915
Comprehensive income (loss) attributable to SemGroup	4,186	9,304	40,477	15,936
Net income per common share (Note 11):
Basic	$ (0.05)	$ (0.07)	$ 1.06	$ 0.02
Diluted	$ (0.05)	$ (0.07)	$ 1.05	$ 0.02
Accumulated Deficit [Member]
Other expenses (income):
Net income (loss)			44,784
Other comprehensive income (loss), net of income taxes			$ 0