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Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Investments	$ 3,770us-gaap_InvestmentsFairValueDisclosure	$ 3,678us-gaap_InvestmentsFairValueDisclosure
Quoted Prices in Active Markets (Level 1) [Member] \| Mark-to-market energy liabilities [Member]
Liabilities:
Mark-to-market energy liabilities	0	0
Quoted Prices in Active Markets (Level 1) [Member] \| Investments in guaranteed income fund [Member]
Assets:
Investments	0	0
Quoted Prices in Active Markets (Level 1) [Member] \| Investments - other [Member]
Assets:
Investments	3,490	3,391
Quoted Prices in Active Markets (Level 1) [Member] \| Mark To Market Energy Assets Including Put Option [Member]
Assets:
Mark-to-market energy assets	0	0
Significant Other Observable Inputs (Level 2) [Member] \| Mark-to-market energy liabilities [Member]
Liabilities:
Mark-to-market energy liabilities	20	1,018
Significant Other Observable Inputs (Level 2) [Member] \| Investments in guaranteed income fund [Member]
Assets:
Investments	0	0
Significant Other Observable Inputs (Level 2) [Member] \| Investments - other [Member]
Assets:
Investments	0	0
Significant Other Observable Inputs (Level 2) [Member] \| Mark To Market Energy Assets Including Put Option [Member]
Assets:
Mark-to-market energy assets	46	1,055
Significant Unobservable Inputs (Level 3) [Member] \| Mark-to-market energy liabilities [Member]
Assets:
Mark-to-market energy assets	0	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Investments in guaranteed income fund [Member]
Assets:
Investments	280	287
Significant Unobservable Inputs (Level 3) [Member] \| Investments - other [Member]
Assets:
Investments	0	0
Recurring [Member] \| Mark-to-market energy liabilities [Member]
Liabilities:
Mark-to-market energy liabilities	20	1,018
Recurring [Member] \| Investments in guaranteed income fund [Member]
Assets:
Investments	280	287
Recurring [Member] \| Investments - other [Member]
Assets:
Investments	3,490	3,391
Recurring [Member] \| Mark To Market Energy Assets Including Put Option [Member]
Assets:
Mark-to-market energy assets	$ 46	$ 1,055

Fair value, after the effects of master netting arrangements, of a financial asset or other 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 assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

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.

+ References+ Details