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Selected Financial Information (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015		Mar. 31, 2014	Mar. 31, 2013
Quarterly Financial Data [Line Items]
Goodwill impairment		$ (283,699)us-gaap_GoodwillImpairmentLoss				$ (56,283)us-gaap_GoodwillImpairmentLoss			$ (283,699)us-gaap_GoodwillImpairmentLoss	[1]	$ (56,283)us-gaap_GoodwillImpairmentLoss
Gain on asset dispositions, net	$ 4,275us-gaap_GainLossOnDispositionOfAssets	$ (1,537)us-gaap_GainLossOnDispositionOfAssets	$ 3,590us-gaap_GainLossOnDispositionOfAssets	$ 2,943us-gaap_GainLossOnDispositionOfAssets	$ 2,363us-gaap_GainLossOnDispositionOfAssets	$ 7,170us-gaap_GainLossOnDispositionOfAssets	$ 49us-gaap_GainLossOnDispositionOfAssets	$ 2,140us-gaap_GainLossOnDispositionOfAssets	$ 9,271us-gaap_GainLossOnDispositionOfAssets		$ 11,722us-gaap_GainLossOnDispositionOfAssets	$ 6,609us-gaap_GainLossOnDispositionOfAssets
[1] The total carrying amount of goodwill at December 31, 2014 is net of accumulated impairment charges of $370.9 million.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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