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Fair Value Measurements of Financial Assets and Liabilities on Recurring and Non Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	$ 0us-gaap_AssetsFairValueDisclosure
Liabilities:
Derivative instruments	(12,547)us-gaap_DerivativeLiabilities
Total fair value	(12,547)us-gaap_FairValueNetAssetLiability
Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0
Liabilities:
Derivative instruments	(12,547)
Total fair value	(12,547)
Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	$ 0

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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