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Line of Credit Facility, Additional Potential Capacity

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Senior Secured Leverage Ratio

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Total funded debt to consolidated EBITDA (as defined in the Credit Agreement)

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Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Long-Term Debt (Narrative) (Detail)	1 Months Ended		9 Months Ended	12 Months Ended
Long-Term Debt (Narrative) (Detail)	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries				$ 2,028,200,000
Gains (Losses) on Extinguishment of Debt			$ 10,000,000	(900,000)	$ (37,700,000)	$ 10,000,000
Debt Issuance Costs, Net				26,400,000	28,400,000
Repayments of Senior Debt		$ 312,900,000
CMLP
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt				$ (900,000)	(37,700,000)	$ 10,000,000
Revolving Loan Facility \| CMLP
Debt Instrument [Line Items]
Debt Instrument, Term				5 years
Credit agreement outstanding carrying value				$ 1,250,000,000	1,500,000,000
Crestwood Midstream Revolver
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt				$ 900,000
Senior Notes, 2023 \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage				6.25%
Senior Notes, 2023 \| Crestwood Midstream 2022 senior unsecured notes \| CMLP
Debt Instrument [Line Items]
Carrying amount				$ 700,000,000	700,000,000
Senior Notes, 2025 \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Carrying amount	$ 500,000,000
Interest rate, stated percentage	5.75%
Senior Notes, 2025 \| Crestwood Midstream 2019 Senior Notes \| CMLP
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 492,000,000
Senior Notes, 2025 \| Crestwood Midstream 2022 senior unsecured notes \| CMLP
Debt Instrument [Line Items]
Carrying amount				500,000,000	500,000,000
Crestwood Midstream Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Additional Potential Capacity				350,000,000
Line of Credit Facility, Current Borrowing Capacity				350,000,000
Crestwood Midstream Credit Facility \| Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Amount				0.0025
Crestwood Midstream Credit Facility \| Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Amount				$ 0.0045
Senior Notes, 2022
Debt Instrument [Line Items]
Debt Issuance Costs, Net					6,800,000
Repayments of Senior Debt					457,800,000
Senior Notes, 2022 \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		2,600,000			1,000,000
Extinguishment of Debt, Amount		163,600,000
Senior Notes, 2020
Debt Instrument [Line Items]
Repayments of Senior Debt					349,900,000
Senior Notes, 2020 \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		4,500,000			5,100,000
Extinguishment of Debt, Amount		$ 161,200,000
Crestwood Midstream Revolver
Debt Instrument [Line Items]
Consolidated leverage ratio, maximum				5.50
Crestwood Midstream Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement outstanding carrying value				$ 578,200,000	318,200,000
Letters of credit outstanding				$ 68,000,000	$ 52,200,000
Total funded debt to consolidated EBITDA				4.25
Consolidated EBITDA to consolidated interest expense				4.4
Senior Secured Leverage Ratio				1.38
Weighted average interest rate				4.79%	4.11%
Unused borrowing capacity				$ 524,000,000
Interest coverage ratio, minimum				2.50
Senior Secured Leverage Ratio, maximum				3.75
Crestwood Midstream Revolver \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Weighted average interest rate				4.63%	3.94%
Crestwood Midstream Revolver \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Weighted average interest rate				6.75%	6.00%
Crestwood Midstream Revolver \| Bridge Loan
Debt Instrument [Line Items]
Credit agreement outstanding carrying value				$ 25,000,000
Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired \| CMLP
Debt Instrument [Line Items]
Total payments due				1,700,000	$ 2,700,000
Obligations under noncompete agreements, unamortized discount				$ 200,000	$ 300,000
Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired \| Minimum \| CMLP
Debt Instrument [Line Items]
Inputed interest				5.02%
Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired \| Maximum \| CMLP
Debt Instrument [Line Items]
Inputed interest				6.75%
Federal Funds Rate \| Revolving Credit Facility \| Crestwood Midstream Revolver
Debt Instrument [Line Items]
Variable interest rate				0.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Credit Facility \| Minimum
Debt Instrument [Line Items]
Variable interest rate				1.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Credit Facility \| Maximum
Debt Instrument [Line Items]
Variable interest rate				2.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Revolver
Debt Instrument [Line Items]
Variable interest rate				1.00%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Revolver \| Minimum
Debt Instrument [Line Items]
Variable interest rate				0.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Revolver \| Maximum
Debt Instrument [Line Items]
Variable interest rate				1.50%
Tres Palacios Holdings LLC
Debt Instrument [Line Items]
Equity method ownership percentage				50.01%
Tres Palacios Holdings LLC \| CMLP
Debt Instrument [Line Items]
Equity method ownership percentage				50.01%
Financial Guarantee [Member]
Debt Instrument [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted				$ 497,000,000
Interest rate, stated percentage				7.50%