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Employee Severance Benefits - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Employee severance benefits	$ 195us-gaap_SeveranceCosts1	$ 14,017us-gaap_SeveranceCosts1
Discontinued Operations
Restructuring Cost and Reserve [Line Items]
Employee severance benefits	92	14,017
General and Administrative Expense
Restructuring Cost and Reserve [Line Items]
Employee severance benefits	$ 103	$ 0

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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