Equity-Based Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			0 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Access Midstream Long-Term Incentive Plan	Jul. 01, 2014 Subsequent Event Management Incentive Compensation Plan	Jul. 01, 2014 Subsequent Event Access Midstream Long-Term Incentive Plan	Jun. 30, 2014 Minimum	Jun. 30, 2014 Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period								4 years	5 years
Stock-based compensation expense	$ 14.0	$ 8.9	$ 23.8	$ 16.3		$ 41.1	$ 38.5
Common units to be awarded					3.5
Unrecognized compensation expense attributable to LTIP					$ 38.5