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Equity Plans (Schedule of Phantom and Restricted Unit Activity) (Details) - $ / shares
12 Months Ended
Nov. 14, 2016
Aug. 12, 2016
May 13, 2016
Feb. 12, 2016
Nov. 13, 2015
Aug. 14, 2015
May 15, 2015
Feb. 13, 2015
Nov. 14, 2014
Aug. 14, 2014
May 15, 2014
Feb. 14, 2014
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Distribution to limited partner, distribution date Nov. 14, 2016 Aug. 12, 2016 May 13, 2016 Feb. 12, 2016 Nov. 13, 2015 Aug. 14, 2015 May 15, 2015 Feb. 13, 2015 Nov. 14, 2014 Aug. 14, 2014 May 15, 2014 Feb. 14, 2014    
Crestwood Midstream Long-Term Incentive Plan | Restricted units                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                            
Unvested units - December 31, units                           834,796
Unvested units - December 31                           $ 23.18
Vested, units                         (457,458)  
Vested                         $ 22.91  
Granted, units                         535,858  
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)                         (823,277)  
Share Based Compensation Arrangement By Share Based Payment Award Other Shares Increase Decrease Weighted Average Grant Date Fair Value                         $ 20.06  
Granted                         $ 15.89  
Canceled, units                         (89,919)  
Canceled                         $ 16.05  
Unvested units - December 31, units                         0  
Unvested units - December 31                         $ 0.00  
Crestwood Midstream Long-Term Incentive Plan | Phantom Share Units (PSUs)                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                            
Vested, units                         (21,578)  
Vested                         $ 16.05  
Granted, units                         171,648  
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)                         (150,070)  
Share Based Compensation Arrangement By Share Based Payment Award Other Shares Increase Decrease Weighted Average Grant Date Fair Value                         $ 18.93  
Granted                         $ 15.76  
Crestwood Long-Term Incentive Plan | Restricted units                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                            
Unvested units - December 31, units                         466,214 131,588
Unvested units - December 31                         $ 69.80 $ 132.10
Vested, units                         (193,295) (91,798)
Vested                         $ 76.82 $ 121.13
Granted, units                         1,067,535 142,255
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)                           226,401
Share Based Compensation Arrangement By Share Based Payment Award Other Shares Increase Decrease Weighted Average Grant Date Fair Value                           $ 68.85
Granted                         $ 14.58 $ 55.25
Canceled, units                         (65,591) (20,994)
Canceled                         $ 25.13 $ 89.97
Unvested units - December 31, units                         1,292,330 466,214
Unvested units - December 31                         $ 24.67 $ 69.80
Crestwood Long-Term Incentive Plan | Phantom Share Units (PSUs)                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                            
Vested, units                           (4,856)
Vested                           $ 67.10
Granted, units                         17,467 42,349
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)                           41,269
Share Based Compensation Arrangement By Share Based Payment Award Other Shares Increase Decrease Weighted Average Grant Date Fair Value                           $ 58.36
Granted                         $ 15.54 $ 62.31
Employee Severance | Crestwood Midstream Long-Term Incentive Plan | Restricted units                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                            
Canceled, units                         (39,172)  
Employee Severance | Crestwood Long-Term Incentive Plan | Restricted units                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                            
Canceled, units                         (7,263)