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Leadership Changes and Restructuring Activities - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Restructuring And Related Activities [Abstract]
Restructuring and related cost, cost incurred during end of year		$ 3,545,000
Restructuring reserve, short-term portion	453,000us-gaap_RestructuringReserveCurrent	500,000us-gaap_RestructuringReserveCurrent
Restructuring reserve, long-term portion	1,321,000us-gaap_RestructuringReserveNoncurrent	1,488,000us-gaap_RestructuringReserveNoncurrent
Additional severance and other related charges	451,000
Expenses related to severance and outplacement services		$ 1,303,000us-gaap_SeveranceCosts1

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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