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Summary of SARs Activity of the long Term Incentive Plan (Detail) - SARs - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, beginning balance 72,000  
Options granted 300,000 80,000
Options exercised (2,000)  
Options forfeited (19,000) (8,000)
Options outstanding, ending balance 351,000 72,000
SARs exercisable 22,000  
Weighted average exercise price, options outstanding beginning balance $ 8.20  
Weighted average exercise price, options granted 9.35 $ 8.20
Weighted average exercise price, options exercised 8.20  
Weighted average exercise price, options forfeited 9.11  
Weighted average exercise price, options outstanding ending balance $ 9.13 $ 8.20