Acquisitions Income Statements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
REVENUES
Affiliate									$ 142,667	$ 77,443	$ 19,477
Third-party									14,172	9,894	9,580
Total Revenues	47,738	43,953	36,885	28,263	29,457	28,622	21,566	7,692	156,839	87,337	29,057
COSTS AND EXPENSES
Operating and maintenance expenses	20,086	20,541	16,566	15,576	15,666	13,857	12,418	12,361	72,769	54,302	50,277
Imbalance settlement gains									(9,686)	(7,153)	(3,250)
Depreciation and amortization expenses									13,057	11,277	11,233
General and administrative expenses									15,713	8,776	3,968
Loss on asset disposals									535	26	830
Total Costs and Expenses									92,388	67,228	63,058
OPERATING INCOME (LOSS)	21,280	18,351	16,265	8,555	9,845	12,888	5,387	(8,011)	64,451	20,109	(34,001)
Less: Interest and financing costs, net									8,992	1,610	0
Add: Interest income									48	0	0
NET INCOME (LOSS)	15,696	16,541	15,226	8,044	9,297	12,287	4,926	(8,011)	55,507	18,499	(34,001)
Less: Income (loss) attributable to Predecessors									(1,284)	(16,069)	(34,001)
Net income attributable to partners									56,791	34,568	0
Tesoro Logistics LP
REVENUES
Affiliate									142,667	77,443	19,477
Third-party									6,181	3,503	3,823
Total Revenues									148,848	80,946	23,300
COSTS AND EXPENSES
Operating and maintenance expenses									66,273	42,474	35,710
Imbalance settlement gains									(9,686)	(7,153)	(3,250)
Depreciation and amortization expenses									10,969	8,078	8,006
General and administrative expenses									15,266	7,990	3,198
Loss on asset disposals									291	1	512
Total Costs and Expenses									83,113	51,390	44,176
OPERATING INCOME (LOSS)									65,735	29,556
Less: Interest and financing costs, net									8,992	1,610
Add: Interest income									48
NET INCOME (LOSS)									56,791	27,946	(20,876)
Less: Income (loss) attributable to Predecessors									0	(6,622)
Net income attributable to partners									56,791	34,568
Martinez Crude Oil Marine Terminal (Predecessor)
REVENUES
Affiliate									0	0	0
Third-party									0	0	0
Total Revenues									0	0	0
COSTS AND EXPENSES
Operating and maintenance expenses									1,558	6,079	8,493
Imbalance settlement gains									0	0	0
Depreciation and amortization expenses									526	2,049	2,050
General and administrative expenses									97	394	380
Loss on asset disposals									236	25	318
Total Costs and Expenses									2,417	8,547	11,241
OPERATING INCOME (LOSS)									(2,417)	(8,547)
Less: Interest and financing costs, net									0	0
Add: Interest income									0
NET INCOME (LOSS)									(2,417)	(8,547)	(11,241)
Less: Income (loss) attributable to Predecessors									(2,417)	(8,547)
Net income attributable to partners									0	0
Long Beach Assets (Predecessor)
REVENUES
Affiliate									0	0	0
Third-party									7,991	6,391	5,757
Total Revenues									7,991	6,391	5,757
COSTS AND EXPENSES
Operating and maintenance expenses									3,976	5,749	6,074
Imbalance settlement gains									0	0	0
Depreciation and amortization expenses									931	1,150	1,177
General and administrative expenses									328	392	390
Loss on asset disposals									8	0	0
Total Costs and Expenses									5,243	7,291	7,641
OPERATING INCOME (LOSS)									2,748	(900)
Less: Interest and financing costs, net									0	0
Add: Interest income									0
NET INCOME (LOSS)									2,748	(900)	(1,884)
Less: Income (loss) attributable to Predecessors									2,748	(900)
Net income attributable to partners									0	0
Anacortes Rail Facility (Predecessor)
REVENUES
Affiliate									0
Third-party									0
Total Revenues									0
COSTS AND EXPENSES
Operating and maintenance expenses									962
Imbalance settlement gains									0
Depreciation and amortization expenses									631
General and administrative expenses									22
Loss on asset disposals									0
Total Costs and Expenses									1,615
OPERATING INCOME (LOSS)									(1,615)
Less: Interest and financing costs, net									0
Add: Interest income									0
NET INCOME (LOSS)									(1,615)
Less: Income (loss) attributable to Predecessors									(1,615)
Net income attributable to partners									$ 0