Description of Business and Basis of Presentation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	Apr. 02, 2013	Mar. 31, 2014	Aug. 02, 2013
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Market value of common units			$ 300
Common stock, shares issued		136,400
Net offering proceeds	399.8	7.6
Payments for commissions		0.1
General partnership interest	2.00%	2.00%
Capital contribution from Partnerships' general partner	8.4	0.1
Common stock, par value	$ 39.86
Common Units
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock, shares issued	10,350,000
Underwriters Overallotment Option
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock, shares issued	1,350,000
General Partner
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
General partnership interest		1.00%
Units outstanding		2,059,446
MidCon Compression, L.L.C.
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Consideration paid for acquisition		$ 160
Combined capacity of compression units		200,000
MidCon Compression, L.L.C. | Minimum
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of compression units acquired		100
GIP I Entities and GIP II
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
General partnership interest		50.00%
Units outstanding		2,059,446
Limited partnership interest		26.70%
GIP I Entities and GIP II | Common Units
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Units outstanding		48,742,361
GIP I Entities and GIP II | General Partner
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
General partnership interest		1.00%
GIP I Entities and GIP II | Convertible Class B Units
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Units outstanding		6,276,661
Williams Acquisition | Common Units
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
General partnership interest		50.00%
Units outstanding		40,137,695
Williams Acquisition | Convertible Class B Units
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Units outstanding		6,276,661
Aggregate
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Limited partnership interest		22.60%
Publicly Owned | Common Units
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Units outstanding		100,392,311
Limited partnership interest		48.70%