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Stock-Based Compensation - Additional Information (Detail)
3 Months Ended
Dec. 20, 2013
shares
Mar. 31, 2016
USD ($)
Incentive_Plan
$ / shares
shares
Mar. 31, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity incentive plans | Incentive_Plan   2  
Total unrecognized compensation expense | $   $ 4,355,000  
Vesting period   1 year 6 months  
Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant 500,000 1,016,949  
Annual increase in number of shares of common stock   4.00%  
Aggregate limit of shares issuable to incentive stock option awards   250,000  
Increase in percentage of outstanding number of shares of common stock 4.00%    
Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of years   10 years  
Exercise price | $ / shares   $ 240.00  
Percentage of vested grant yearly   25.00%  
Percentage of vested grant monthly   75.00%  
Number of SARs, outstanding   9,217 9,217
Number of SARs, Granted   0  
Number of SARs, Exercised   0  
Number of SARs, Forfeited   0  
Vesting period of grant date   3 years  
Reduced compensation expense | $   $ 0 $ 0
Restricted Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of years   10 years  
Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unexercised vested option forfeiture   3 months  
Options [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of years   10 years