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Severance Agreement Charges - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2012 Vice President [Member]	Dec. 31, 2013 Vice President [Member]
Severance Agreement Charges [Line Items]
Severance agreement charges	$ 493	$ 253	$ 473	$ 845	$ 143
Retirement benefit monthly payments for each of the 18 consecutive months						24
Retirement benefit monthly payments number of consecutive period						18 months
Stock option, vesting period, exercisable						90 days
Estimated future costs				$ 845

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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