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Equity Plans (Schedule of Phantom and Restricted Unit Activity) (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
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 131,588 49,354
Unvested units - December 31 $ 132.1 $ 139.6
Vested, units (91,798) (44,993)
Vested $ 121.13 $ 139.7
Granted, units 142,255 137,746
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 $ 55.25 $ 132.3
Canceled, units (20,994) (10,519)
Canceled $ 89.97 $ 137.3
Unvested units - December 31, units 466,214 131,588
Unvested units - December 31 $ 69.8 $ 132.1
Crestwood Long-Term Incentive Plan | Restricted units | Employee Severance    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Canceled, units (7,263)  
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 $ 67.1  
Granted, units 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 $ 62.31  
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 834,796 250,557
Unvested units - December 31 $ 23.18 $ 22.13
Vested, units (457,458) (208,361)
Vested $ 22.91 $ 22.15
Granted, units 535,858 871,078
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 $ 23.25
Canceled, units (89,919) (78,478)
Canceled $ 16.05 $ 23.33
Unvested units - December 31, units 0 834,796
Unvested units - December 31 $ 0.00 $ 23.18
Crestwood Midstream Long-Term Incentive Plan | Restricted units | Employee Severance    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Canceled, units (39,172)  
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