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Stockholders' Equity - Additional Information (Detail) - shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders Equity Note [Abstract]        
Existing long-term incentive plan       200,000
Shares available for future award under proposed long term incentive plan 163,500      
Shares awarded under proposed long term incentive plan 13,500 8,000 8,000  
Number of shares authorized for repurchase       2,000,000
Shares available for repurchase under the plan 1,951,000