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Long-Term Compensation Plan and Stock Based Compensation - Details of Long-Term Compensation Plan and Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation [Abstract]        
Restricted stock $ 532 $ 1,396 $ 1,076 $ 2,943
Long-term compensation plan 300 449 856 935
Total Non-Cash Compensation $ 832 $ 1,845 $ 1,932 $ 3,878