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Consolidated EBITDA to consolidated interest expense (as defined in the Credit Agreement)

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Consolidated Leverage Ratio Maximum.

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Interest Coverage Ratio, Minimum

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Senior Secured Leverage Ratio

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Senior Secured Leverage Ratio, maximum

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Weighted average interest rate of debt outstanding.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of cash distribution paid to unit-holder of limited partnership (LP).

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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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 amount of cash paid for interest during the period.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Long-Term Debt (Narrative) (Detail)														1 Months Ended				3 Months Ended		9 Months Ended	12 Months Ended
Long-Term Debt (Narrative) (Detail)	Feb. 14, 2017 USD ($)	Nov. 14, 2016 USD ($)	Aug. 12, 2016 USD ($)	May 13, 2016 USD ($)	Feb. 12, 2016 USD ($)	Nov. 13, 2015 USD ($)	Aug. 14, 2015 USD ($)	May 15, 2015 USD ($)	Feb. 13, 2015 USD ($)	Nov. 14, 2014 USD ($)	Aug. 14, 2014 USD ($)	May 15, 2014 USD ($)	Feb. 14, 2014 USD ($)	Apr. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	$ 41,800,000	$ 41,400,000	$ 41,400,000	$ 41,400,000	$ 95,600,000	$ 94,300,000	$ 25,700,000	$ 25,700,000	$ 25,800,000	$ 25,600,000	$ 25,600,000	$ 25,700,000	$ 25,600,000								$ 219,800,000	$ 171,500,000	$ 102,500,000
Gains (Losses) on Extinguishment of Debt																		$ (37,300,000)	$ 0		10,000,000	(20,000,000)	0
Senior Secured Leverage Ratio															0.94			0.94
Senior Secured Leverage Ratio, maximum															3.75			3.75
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries																					2,550,700,000
Repayments of Senior Debt																$ 312,900,000
Early Repayment of Senior Debt																					0	13,600,000	0
Deferred Finance Costs, Net															$ 33,800,000			$ 33,800,000			$ 34,000,000	40,900,000
Financial Guarantee [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																					7.50%
Guarantor Obligations, Maximum Exposure, Undiscounted																					$ 497,000,000
Crestwood Midstream Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity															350,000,000			350,000,000			$ 350,000,000
Line of Credit Facility, Lender Consent Borrowing Capacity															325,000,000			$ 325,000,000
Crestwood Midstream Credit Facility \| Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage																					0.30%
Crestwood Midstream Credit Facility \| Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage																					0.50%
Crestwood Midstream Credit Facility \| Revolving Credit Facility \| Eurodollar [Member] \| Minimum
Debt Instrument [Line Items]
Variable interest rate																					1.75%
Crestwood Midstream Credit Facility \| Revolving Credit Facility \| Eurodollar [Member] \| Maximum
Debt Instrument [Line Items]
Variable interest rate																					2.75%
Crestwood Midstream Revolver
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt																				$ (1,800,000)
Consolidated leverage ratio, maximum																		550.00%			550.00%
Crestwood Midstream Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount															644,400,000			$ 644,400,000			$ 734,400,000
Letters of credit outstanding															$ 70,800,000			$ 70,800,000			$ 64,000,000	$ 62,200,000
Debt, Weighted Average Interest Rate															3.36%			3.36%			3.23%	2.70%
Total funded debt to consolidated EBITDA																		3.92			3.74
Consolidated EBITDA to consolidated interest expense																		3.90			3.92
Senior Secured Leverage Ratio																					0.18
Interest Coverage Ratio Minimum																		2.50			2.50
Senior Secured Leverage Ratio, maximum																					3.75
Crestwood Midstream Revolver \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate															3.15%			3.15%			3.21%	2.70%
Crestwood Midstream Revolver \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate															5.25%			5.25%			5.25%	5.00%
Crestwood Midstream Revolver \| Revolving Credit Facility \| Federal Funds Rate
Debt Instrument [Line Items]
Variable interest rate																					0.50%
Crestwood Midstream Revolver \| Revolving Credit Facility \| Eurodollar [Member]
Debt Instrument [Line Items]
Variable interest rate																					1.00%
Crestwood Midstream Revolver \| Revolving Credit Facility \| Eurodollar [Member] \| Minimum
Debt Instrument [Line Items]
Variable interest rate																					0.75%
Crestwood Midstream Revolver \| Revolving Credit Facility \| Eurodollar [Member] \| Maximum
Debt Instrument [Line Items]
Variable interest rate																					1.75%
Crestwood Midstream Revolver \| Bridge Loan
Debt Instrument [Line Items]
Credit agreement outstanding carrying value																					$ 25,000,000
Crestwood Midstream Revolver \| Line of Credit [Member] \| Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from Issuance of Debt																				720,000,000
Senior Notes, 2020
Debt Instrument [Line Items]
Repayments of Senior Debt															$ 325,000,000
Senior Notes, 2020 \| Subsequent Event
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt														$ (300,000)
Repayments of Senior Debt														$ 14,200,000
Senior Notes, 2020 \| Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																					6.00%
Senior notes															13,800,000			$ 13,800,000			$ 338,800,000	$ 500,000,000
Extinguishment of Debt, Amount															13,800,000	161,200,000
Interest Paid																4,500,000		4,800,000
Senior Notes, 2022
Debt Instrument [Line Items]
Repayments of Senior Debt															793,500,000
Deferred Finance Costs, Net															6,800,000			6,800,000
Senior Notes, 2022 \| Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																					6.125%
Senior notes															0			0			$ 436,400,000	600,000,000
Extinguishment of Debt, Amount																163,600,000
Interest Paid																$ 2,600,000		1,000,000
Senior Notes, 2023 \| Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																					6.25%
Senior notes															$ 700,000,000			$ 700,000,000			$ 700,000,000	700,000,000
Senior Notes, 2019
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt																	$ (17,100,000)
Senior Notes, 2019 \| Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																	7.75%
Interest Paid																	$ 500,000
Early Repayment of Senior Debt																	364,100,000
Call Premium On Debt Redemption																	13,600,000
Senior Notes, 2025 \| Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage															5.75%			5.75%
Senior notes															$ 500,000,000			$ 500,000,000			0
Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid							$ 74,300,000	$ 74,300,000	$ 74,300,000	$ 74,100,000	$ 74,100,000	$ 74,200,000	$ 74,100,000									222,900,000	296,500,000
Gains (Losses) on Extinguishment of Debt																		(37,300,000)	$ 0		10,000,000	(18,900,000)	0
Early Repayment of Senior Debt																					0	13,600,000	$ 0
Crestwood Midstream Partners LP \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement outstanding carrying value																					1,500,000,000	1,000,000,000
Crestwood Midstream Partners LP \| Senior Notes, 2020
Debt Instrument [Line Items]
Senior notes															13,900,000			13,900,000			340,600,000	503,300,000
Crestwood Midstream Partners LP \| Senior Notes, 2022
Debt Instrument [Line Items]
Senior notes															0			0			429,300,000	588,400,000
Crestwood Midstream Partners LP \| Senior Notes, 2023
Debt Instrument [Line Items]
Senior notes															691,000,000			691,000,000			690,600,000	689,400,000
Crestwood Midstream Partners LP \| Senior Notes, 2023 \| Senior Notes
Debt Instrument [Line Items]
Proceeds from Issuance of Debt																					688,300,000
Crestwood Midstream Partners LP \| Senior Notes, 2019 \| Senior Notes
Debt Instrument [Line Items]
Long-term Debt																	$ 350,000,000
Crestwood Midstream Partners LP \| Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired
Debt Instrument [Line Items]
Total payments due																					4,200,000	6,600,000
Obligations under noncompete agreements, unamortized discount																					$ 500,000	1,300,000
Crestwood Midstream Partners LP \| Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired \| Minimum
Debt Instrument [Line Items]
Inputed interest																					5.02%
Crestwood Midstream Partners LP \| Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired \| Maximum
Debt Instrument [Line Items]
Inputed interest																					8.00%
Crestwood Midstream Partners LP \| Senior Notes, 2025
Debt Instrument [Line Items]
Senior notes															$ 491,600,000			491,600,000			$ 0
Crestwood Midstream Partners LP \| Senior Notes, 2025 \| Senior Notes
Debt Instrument [Line Items]
Proceeds from Issuance of Debt																		$ 492,000,000
Crestwood Equity Partners LP
Debt Instrument [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid																				$ 378,300,000
Crestwood Equity Partners LP \| Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired
Debt Instrument [Line Items]
Total payments due																					4,200,000	6,800,000
Obligations under noncompete agreements, unamortized discount																					$ 500,000	$ 1,300,000
Crestwood Equity Partners LP \| Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired \| Minimum
Debt Instrument [Line Items]
Inputed interest																					5.02%
Crestwood Equity Partners LP \| Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired \| Maximum
Debt Instrument [Line Items]
Inputed interest																					8.00%