Organization and Description of Business (Narrative) (Detail) $ / shares in Units, $ in Millions				1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 12, 2016 shares	Oct. 07, 2013 USD ($) shares	May. 06, 2013 USD ($)	Jan. 31, 2016 shares	Oct. 31, 2013 USD ($) $ / unit	Dec. 31, 2015 shares	Sep. 30, 2015 segment	Dec. 31, 2015 reporting_units $ / shares shares	Dec. 31, 2014 shares
Partnership Organization And Basis Of Presentation [Line Items]
Conversion ratio							2.75
Cash payments to unitholders upon completion of merger, per unit | $ / unit					1.03
Distribution made to limited partners								1,372,573
Number of operating segments							3	3
CMLP
Partnership Organization And Basis Of Presentation [Line Items]
Cash | $		$ 34.9
CMLP
Partnership Organization And Basis Of Presentation [Line Items]
Distribution percentage								50.00%
Conversion ratio		1.07
Cash | $					$ 34.9
Distribution made to limited partners								1,271,935	387,991
Crestwood Equity Partners LP
Partnership Organization And Basis Of Presentation [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest							99.90%	99.90%
Treasury Stock, Shares, Acquired						3,458,912
Crestwood Gas Services GP, LLC [Member]
Partnership Organization And Basis Of Presentation [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest							0.10%	0.10%
Crestwood Holdings
Partnership Organization And Basis Of Presentation [Line Items]
Cash | $					10.0
Cash payments to unitholders upon completion of merger | $			$ 10.0
Parent Company
Partnership Organization And Basis Of Presentation [Line Items]
Cash | $					$ 24.9
Distribution Rights
Partnership Organization And Basis Of Presentation [Line Items]
Distribution declared per limited partner unit | $ / shares								$ 0.37
Distribution Rights | Crestwood Equity Partners LP
Partnership Organization And Basis Of Presentation [Line Items]
Distribution percentage							100.00%
Crestwood Holdings | Crestwood Equity Partners LP
Partnership Organization And Basis Of Presentation [Line Items]
Shares issued by acquiree		14,300,000
Crestwood Holdings | Majority Shareholder
Partnership Organization And Basis Of Presentation [Line Items]
Shares exchanged by acquirer		7,100,000
Common Unit Capital | Crestwood Holdings
Partnership Organization And Basis Of Presentation [Line Items]
General partner ownership percentage								21.00%
Subordinated Unit
Partnership Organization And Basis Of Presentation [Line Items]
Units of partnership interest, amount						438,789		438,789
Subsequent Event
Partnership Organization And Basis Of Presentation [Line Items]
Distribution made to limited partners	1,404,317
Subsequent Event | Crestwood Equity Partners LP
Partnership Organization And Basis Of Presentation [Line Items]
Treasury Stock, Shares, Acquired				1,525,430