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Stock-Based Compensation and Stock Awards - Stock Options - Additional Information (Detail)
12 Months Ended
May 13, 2004
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of stock options exercised   $ 1,000,000 $ 800,000 $ 2,000,000
Stock-based compensation expense for stock option exercises   0 1,100,000 2,500,000
Capitalized expense   0 0 0
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Income tax benefit realized from stock options exercised   $ 357,000 $ 263,000 $ 718,000
Anti-dilutive stock option shares (in shares) | shares   0    
Unrecognized compensation expense related to share based compensation   $ 0    
2004 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
The maximum number of shares authorized (in shares) | shares 2,696,294      
Options granted period 10 years      
Cumulative annual increments of the total number of shares 0.25      
2004 Plan [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 4 years