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Long-Term Debt (Narrative) (Detail)
1 Months Ended 6 Months Ended
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
Debt Instrument [Line Items]          
Senior Secured Leverage Ratio, maximum     3.75    
Senior Secured Leverage Ratio     1.28    
Senior Notes, due 2027          
Debt Instrument [Line Items]          
Proceeds from Issuance of Debt $ 591,100,000        
Crestwood Midstream Revolver          
Debt Instrument [Line Items]          
Consolidated Leverage Ratio Maximum     5.50    
Crestwood Midstream Revolver | Revolving Credit Facility          
Debt Instrument [Line Items]          
Available capacity     $ 424,900,000    
Letters of credit outstanding     $ 23,900,000 $ 31,700,000  
Debt, Weighted Average Interest Rate     2.44% 4.00%  
Interest Coverage Ratio Minimum     2.50    
Total Funded Debt to Consolidated Ebitda     4.16    
Consolidated Ebitda To Consolidated Interest Expense     4.62    
Line of Credit Facility, Increase (Decrease), Net   $ 250,000,000      
Crestwood Midstream Revolver | Revolving Credit Facility | Minimum          
Debt Instrument [Line Items]          
Debt, Weighted Average Interest Rate     2.43% 3.96%  
Crestwood Midstream Revolver | Revolving Credit Facility | Maximum          
Debt Instrument [Line Items]          
Debt, Weighted Average Interest Rate     4.50% 6.00%  
Senior Notes | Senior Notes, due 2027          
Debt Instrument [Line Items]          
Senior notes   $ 600,000,000 $ 600,000,000.0 $ 600,000,000.0  
Debt Instrument, Interest Rate, Stated Percentage   5.625%      
Senior Notes | Senior Notes, 2025          
Debt Instrument [Line Items]          
Senior notes     500,000,000.0 500,000,000.0  
Senior Notes | Senior Notes, 2023          
Debt Instrument [Line Items]          
Senior notes     $ 700,000,000.0 $ 700,000,000.0  
Jackalope Gas Gathering Services, L.L.C.          
Debt Instrument [Line Items]          
Ownership percentage   50.00%     50.00%