Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 5,521us-gaap_ProfitLoss	$ 15,916us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	119,592us-gaap_Depreciation	101,929us-gaap_Depreciation
Amortization of intangible assets	15,826us-gaap_AmortizationOfIntangibleAssets	15,978us-gaap_AmortizationOfIntangibleAssets
Impairment expense	25,523us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Amortization of deferred financing costs and debt discount	1,635	2,824
Accretion of asset retirement obligations	193	168
Amortization of deferred contract cost	52	875
Phantom unit compensation expense	5,923us-gaap_ShareBasedCompensation	6,043us-gaap_ShareBasedCompensation
Equity in earnings from unconsolidated affiliates	(512)	(250)
Distributions from unconsolidated affiliates	14,938	1,369
Unrealized loss (gain) on derivative instruments	8,160us-gaap_UnrealizedGainLossOnDerivatives	(11,820)us-gaap_UnrealizedGainLossOnDerivatives
Gain on disposal of property, plant and equipment	(811)us-gaap_GainLossOnDispositionOfAssets	(93)us-gaap_GainLossOnDispositionOfAssets
Deferred income taxes	(4,160)us-gaap_DeferredIncomeTaxExpenseBenefit	12,201us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities, net of working capital acquired:
Receivables	38,630us-gaap_IncreaseDecreaseInReceivables	(3,132)us-gaap_IncreaseDecreaseInReceivables
Receivables from unconsolidated affiliates	1,428	0
Inventories	4,477us-gaap_IncreaseDecreaseInInventories	(6,303)us-gaap_IncreaseDecreaseInInventories
Other current assets	11,977	1,922
Accounts payable and accrued liabilities	(47,077)	(29,798)
Payables to unconsolidated affiliates	2,674	0
Other long-term assets	(26)	460
Other long-term liabilities	(3,029)	4,084
Net cash provided by operating activities	200,934	112,373
Cash flows from investing activities:
Restricted cash	10,000	0
Capital expenditures	(438,271)	(587,120)
Investment in unconsolidated affiliates	(47,426)	(7,498)
Proceeds from disposal of property, plant and equipment	857	19,144
Net cash flows used in investing activities	(474,840)	(575,474)
Cash flows from financing activities:
Proceeds from public equity offerings, net	0	271,880
Proceeds from Credit Facility	601,900us-gaap_ProceedsFromLinesOfCredit	377,300us-gaap_ProceedsFromLinesOfCredit
Payments of Credit Facility	(699,500)us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit
Proceeds from long-term debt	660,563	0
Payments for debt issuance costs, deferred financing costs and registration costs	(7,000)	(1,890)
Proceeds from sale of equity interest in joint venture	10,823	0
Contributions from non-controlling interest	19,571	0
Payments of SMR liability	(652)mwe_PaymentOfLiability	(594)mwe_PaymentOfLiability
Cash paid for taxes related to net settlement of share-based payment awards	(6,117)	(8,924)
Payment of distributions to common unitholders	(168,718)us-gaap_PaymentsOfDividendsCommonStock	(136,405)us-gaap_PaymentsOfDividendsCommonStock
Payment of distributions to non-controlling interest	(9,567)	(90)
Net cash flows provided by financing activities	401,303	501,277
Net increase in cash and cash equivalents	127,397	38,176
Cash and cash equivalents at beginning of period	108,887	85,305
Cash and cash equivalents at end of period	$ 236,284	$ 123,481

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

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The cash inflow from the issuance of common limited partners units during the period.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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