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Stock Compensation Plans - Details of Long-Term Compensation Plan and Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation [Abstract]      
Restricted stock $ 2,766 $ 3,835 $ 2,399
Long-term compensation plan 2,105 1,815 851
Total expense $ 4,871 $ 5,650 $ 3,250