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Equity Plans (Schedule of Phantom and Restricted Unit Activity) (Detail) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
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  
Vested, units (457,458)  
Granted, units 535,858  
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease) (823,277)  
Canceled, units (89,919)  
Unvested units - December 31, units 0 834,796
Unvested units - December 31 $ 23.18  
Vested 22.91  
Granted 15.89  
Share Based Compensation Arrangement By Share Based Payment Award Other Shares Increase Decrease Weighted Average Grant Date Fair Value 20.06  
Canceled 16.05  
Unvested units - December 31 $ 0.00 $ 23.18
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)  
Granted, units 171,648  
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease) (150,070)  
Vested $ 16.05  
Granted 15.76  
Share Based Compensation Arrangement By Share Based Payment Award Other Shares Increase Decrease Weighted Average Grant Date Fair Value $ 18.93  
Crestwood LTIP | 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
Vested, units (193,295) (91,798)
Granted, units 1,067,535 142,255
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)   226,401
Canceled, units (65,591) (20,994)
Unvested units - December 31, units 1,292,330 466,214
Unvested units - December 31 $ 69.80 $ 132.10
Vested 76.82 121.13
Granted 14.58 55.25
Share Based Compensation Arrangement By Share Based Payment Award Other Shares Increase Decrease Weighted Average Grant Date Fair Value   68.85
Canceled 25.13 89.97
Unvested units - December 31 $ 24.67 $ 69.80
Crestwood LTIP | 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)
Granted, units 17,467 42,349
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)   41,269
Vested   $ 67.10
Granted $ 15.54 62.31
Share Based Compensation Arrangement By Share Based Payment Award Other Shares Increase Decrease Weighted Average Grant Date Fair Value   $ 58.36
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 LTIP | 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)