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Share-based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 22, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise period of options 10 years      
2015 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant 800,000      
Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance target for achievement period 3 years      
Non-Employee Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-employee director compensation grant period 5 years      
Minimum [Member] | Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of performance target for achievement 0.00%      
Maximum [Member] | Graded and Cliff Vesting [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of options 5 years      
Maximum [Member] | Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of performance target for achievement 150.00%      
Stock Compensation Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized share-based compensation expense $ 5.6      
Period of recognition of share-based compensation expense 1 year 8 months 12 days      
Share-based compensation expense $ 5.1 $ 5.3 $ 3.7  
Stock Compensation Plans [Member] | 2015 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum aggregate number of shares 1,550,000      
Shares available for grant       900,000
Plan description As of December 31, 2019, subject to adjustments as provided in the 2015 Plan, the maximum aggregate number of shares of the Company’s common stock that could be issued under the 2015 Plan could not exceed the sum of (i) 1.55 million shares plus (ii) any shares (A) remaining available for the grant of awards as of the 2015 Plan effective date (April 22, 2015) under the 2007 Plan or the 2011 Plan, and/or (B) subject to an award granted under the 2007 Plan or the 2011 Plan, which award is forfeited, cancelled, terminated, expires, or lapses without the issuance of shares or pursuant to which such shares are forfeited. As of the effectiveness of the 2015 Plan (April 22, 2015), there were 922 thousand shares available for grant under the 2015 Plan, inclusive of shares previously available for grant under the 2007 Plan and the 2011 Plan that were rolled over to the 2015 Plan.      
Restricted Stock [Member] | Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance target for achievement period 1 year      
Deferred compensation arrangement with individual, description Each participant in the program is eligible to earn an RSA, subject to performance over a one-year period. Payout under the program can range from 0% to 150% of target based on the achievement of five Company performance metrics and individual performance goals (subject to continued employment and certain other terms and conditions of the program).      
Vesting period of options 2 years      
Restricted Stock [Member] | Minimum [Member] | Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of performance target for achievement 0.00%      
Restricted Stock [Member] | Maximum [Member] | Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of performance target for achievement 150.00%