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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation [Abstract]      
Restricted stock $ 3,835 $ 2,399 $ 2,472
Long-term Cash Incentives 1,815 851 115
Total expense $ 5,650 $ 3,250 $ 2,587