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
	Mar. 31, 2014		Mar. 31, 2013
Earnings Per Unit [Line Items]
Net income attributable to Access Midstream Partners, L.P.	$ 61,078		$ 59,538
Less general partner interest in net income	(19,616)		(4,792)
Limited partner interest in net income	41,462		54,746
Common Units
Earnings Per Unit [Line Items]
Limited partner interest in net income	27,342	[1]	13,447	[1]
Subordinated units
Earnings Per Unit [Line Items]
Limited partner interest in net income			19,837
Convertible Class B Units
Earnings Per Unit [Line Items]
Limited partner interest in net income	9,650	[1]	10,230	[1]
Subordinated Class C Units
Earnings Per Unit [Line Items]
Limited partner interest in net income	$ 4,470	[1]	$ 11,232	[1]
Limited Partner
Weighted average limited partner units outstanding – basic and diluted
Weighted average limited partner units outstanding basic and diluted	184,227,500		167,497,527
Limited Partner | Common Units
Net income per limited partner unit – basic and diluted
Net income per limited partner unit – basic and diluted	$ 0.15		$ 0.14
Weighted average limited partner units outstanding – basic and diluted
Weighted average limited partner units outstanding basic and diluted	184,227,500		98,421,405
Limited Partner | Subordinated units
Net income per limited partner unit – basic and diluted
Net income per limited partner unit – basic and diluted			$ 0.29
Weighted average limited partner units outstanding – basic and diluted
Weighted average limited partner units outstanding basic and diluted			69,076,122

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