Partnership's Calculation of Net Income Per Unit for Common and Subordinated Limited Partner Units (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Earnings Per Unit [Line Items]
Net income attributable to Access Midstream Partners, L.P.	$ 67,454		$ 69,213		$ 128,532		$ 128,751
Less general partner interest in net income	(23,526)		(5,995)		(43,142)		(10,787)
Limited partner interest in net income	43,928		63,218		85,390		117,964
Common Units
Earnings Per Unit [Line Items]
Limited partner interest in net income	33,915	[1]	19,116	[1]	61,257	[1]	32,563	[1]
Subordinated units
Earnings Per Unit [Line Items]
Limited partner interest in net income			21,721				41,558
Class B Units
Earnings Per Unit [Line Items]
Limited partner interest in net income	10,013	[1]	10,755	[1]	19,663	[1]	20,985	[1]
Class C Units
Earnings Per Unit [Line Items]
Limited partner interest in net income			$ 11,626	[1]	$ 4,470	[1]	$ 22,858	[1]
Limited Partner
Weighted average limited partner units outstanding - basic and diluted
Weighted average limited partner units outstanding basic and diluted	190,953,800		177,749,514		187,609,231		172,651,841
Limited Partner | Common Units
Net income per limited partner unit – basic and diluted
Net income per limited partner unit - basic and diluted	$ 0.18		$ 0.18		$ 0.33		$ 0.32
Weighted average limited partner units outstanding - basic and diluted
Weighted average limited partner units outstanding basic and diluted	190,953,800		108,673,392		187,609,231		103,575,719
Limited Partner | Subordinated units
Net income per limited partner unit – basic and diluted
Net income per limited partner unit - basic and diluted			$ 0.31				$ 0.60
Weighted average limited partner units outstanding - basic and diluted
Weighted average limited partner units outstanding basic and diluted			69,076,122				69,076,122

[1] Adjusted to reflect amortization for the beneficial conversion feature.