Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 27,861	$ 17,229	$ 19,963	$ 64,994
Accounts receivable	210,379	222,409
Prepaid expenses	17,723	10,182
Other current assets	9,507	8,111
Total current assets	265,470	257,931
Property, plant and equipment
Gathering systems	6,609,159	5,974,940
Other fixed assets	380,102	175,411
Less: Accumulated depreciation	(1,050,129)	(859,551)
Total property, plant and equipment, net	5,939,132	5,290,800
Investments in unconsolidated affiliates	2,177,899	1,936,603
Intangible customer relationships, net	354,558	372,391
Deferred loan costs, net	61,879	59,721
Total assets	8,798,938	7,917,446	7,572,092
Current liabilities
Accounts payable	63,578	37,520
Accrued liabilities	230,970	268,952
Total current liabilities	294,548	306,472
Long-term liabilities
Long-term debt	4,120,728	3,249,230
Other liabilities	18,856	8,954
Total long-term liabilities	4,139,584	3,258,184
Partners' capital
Total partners' capital attributable to Access Midstream Partners, L.P.	3,946,998	4,098,906
Noncontrolling interest	417,808	253,884
Total partners' capital	4,364,806	4,352,790
Total liabilities and partners' capital	8,798,938	7,917,446
Eliminations
Current assets
Intercompany receivable from parent	(8,582)
Total current assets	(8,582)
Property, plant and equipment
Investments in unconsolidated affiliates	(3,891,808)	(3,455,590)
Intercompany receivable from parent	(4,270,190)	(3,905,726)
Total assets	(8,170,580)	(7,361,316)
Current liabilities
Intercompany payable to parent	(8,582)	(23,435)
Total current liabilities	(8,582)	(23,435)
Long-term liabilities
Intercompany payable to parent	(4,270,190)	(3,882,290)
Total long-term liabilities	(4,270,190)	(3,882,290)
Partners' capital
Total partners' capital attributable to Access Midstream Partners, L.P.	(4,309,616)	(3,709,475)
Noncontrolling interest	417,808	253,884
Total partners' capital	(3,891,808)	(3,455,591)
Total liabilities and partners' capital	(8,170,580)	(7,361,316)
Parent | Reportable Legal Entities
Property, plant and equipment
Investments in unconsolidated affiliates	3,270,157	3,076,205
Intercompany receivable from parent	4,270,190	3,882,291
Deferred loan costs, net	61,879	46,140
Total assets	7,602,226	7,004,636
Long-term liabilities
Long-term debt	3,655,228	2,905,730
Total long-term liabilities	3,655,228	2,905,730
Partners' capital
Total partners' capital attributable to Access Midstream Partners, L.P.	3,946,998	4,098,906
Total partners' capital	3,946,998	4,098,906
Total liabilities and partners' capital	7,602,226	7,004,636
Guarantor Subsidiaries | Reportable Legal Entities
Current assets
Cash and cash equivalents	7	400	(593)	63,216
Accounts receivable	175,357	202,007
Intercompany receivable from parent	7,972
Prepaid expenses	17,491	10,182
Other current assets	9,199	7,569
Total current assets	210,026	220,158
Property, plant and equipment
Gathering systems	5,522,305	5,295,771
Other fixed assets	379,046	175,397
Less: Accumulated depreciation	(1,021,418)	(845,892)
Total property, plant and equipment, net	4,879,933	4,625,276
Investments in unconsolidated affiliates	2,799,550	2,315,988
Intangible customer relationships, net	354,558	372,391
Intercompany receivable from parent		3,105
Deferred loan costs, net		13,581
Total assets	8,244,067	7,550,499
Current liabilities
Accounts payable	39,140	36,638
Accrued liabilities	180,814	203,099
Total current liabilities	219,954	239,737
Long-term liabilities
Long-term debt	465,500	343,500
Intercompany payable to parent	4,270,190	3,882,290
Other liabilities	18,266	8,767
Total long-term liabilities	4,753,956	4,234,557
Partners' capital
Total partners' capital attributable to Access Midstream Partners, L.P.	3,270,157	3,076,205
Total partners' capital	3,270,157	3,076,205
Total liabilities and partners' capital	8,244,067	7,550,499
Non-Guarantors | Reportable Legal Entities
Current assets
Cash and cash equivalents	27,854	16,829	20,556	1,778
Accounts receivable	35,022	20,402
Intercompany receivable from parent	610
Prepaid expenses	232
Other current assets	308	542
Total current assets	64,026	37,773
Property, plant and equipment
Gathering systems	1,086,854	679,169
Other fixed assets	1,056	14
Less: Accumulated depreciation	(28,711)	(13,659)
Total property, plant and equipment, net	1,059,199	665,524
Intercompany receivable from parent		20,330
Total assets	1,123,225	723,627
Current liabilities
Accounts payable	24,438	882
Accrued liabilities	50,156	65,853
Intercompany payable to parent	8,582	23,435
Total current liabilities	83,176	90,170
Long-term liabilities
Other liabilities	590	187
Total long-term liabilities	590	187
Partners' capital
Total partners' capital attributable to Access Midstream Partners, L.P.	1,039,459	633,270
Total partners' capital	1,039,459	633,270
Total liabilities and partners' capital	$ 1,123,225	$ 723,627