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Stock-Based Compensation - Compensation Expense Recorded for All Stock Options, Stock Awards and SARs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share Based Compensation Allocation And Classification In Financial Statements [Abstract]    
Compensation expense $ 798us-gaap_ShareBasedCompensation $ 226us-gaap_ShareBasedCompensation