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- Definition

Number of persons employed by the Entity

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- Definition

Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Costs of sales and operating expenses for the period incurred from transactions with related parties.

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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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- Definition

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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- Definition

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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No definition available.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Related Party Transactions (Detail) $ in Millions	3 Months Ended		12 Months Ended
Related Party Transactions (Detail) $ in Millions	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2015 Person
Related Party Transaction [Line Items]
General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net(4)	$ 4.7	$ 0.7	$ 7.7	$ 2.8	$ 0.2
Gathering and processing revenues at CEQP and CMLP	0.5	0.7	2.6	3.9	3.0
Affiliated Entity
Related Party Transaction [Line Items]
Gathering and processing revenues at CEQP and CMLP	0.5	0.7	2.6	3.9	3.0
Gathering and processing costs of product/services sold at CEQP and CMLP(1)	4.1	4.3	17.7	28.9	42.2
General and administrative expenses charged by CEQP to CMLP, net(3)	5.5	3.7	13.0	49.5	63.6
Related party receivables	7.8		5.6
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts payable at CEQP	2.5		2.5
Crestwood Equity Partners LP
Related Party Transaction [Line Items]
Related Party Transaction, (Income) Expenses from Transactions with Related Party	(0.8)	0.1	(2.2)	0.4	0.5
Crestwood Equity Partners LP \| Affiliated Entity
Related Party Transaction [Line Items]
Related party receivables			5.6	5.2
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts payable at CEQP			2.5	4.0
Crestwood Midstream Partners LP
Related Party Transaction [Line Items]
Entity Number of Employees \| Person						100
Gathering and processing revenues at CEQP and CMLP	0.5	0.7	2.6	3.9	3.0
Crestwood Midstream Partners LP \| Affiliated Entity
Related Party Transaction [Line Items]
General and administrative expenses charged by CEQP to CMLP, net(3)	0.8		3.0	0.8
Related party receivables			5.6	5.2
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts payable at CEQP			0.0	1.5
Tres Palacios Storage Company LLC
Related Party Transaction [Line Items]
General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net(4)			2.7	2.8	0.2
Crestwood LTIP \| Crestwood Midstream Partners LP
Related Party Transaction [Line Items]
Allocated Share-based Compensation Expense	6.3	4.5	16.0	10.0	$ 6.9
Crestwood LTIP \| Crestwood Holdings [Member]
Related Party Transaction [Line Items]
Allocated Share-based Compensation Expense	1.0	0.1	3.2	$ 0.1
Stagecoach Gas Services LLC
Related Party Transaction [Line Items]
General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net(4)	2.6		$ 5.0
Tres Palacios Holdings LLC
Related Party Transaction [Line Items]
General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net(4)	0.9	$ 0.7
Crestwood Permian Basin Holdings LLC
Related Party Transaction [Line Items]
General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net(4)	$ 1.2