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Share-based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Apr. 22, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant 202,000   202,000    
Non-employee director compensation grant period     5 days    
Exercise period of options     10 years    
2015 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant 202,000   202,000    
Long Term Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance target for achievement period     3 years    
Minimum [Member] | Graded and Cliff Vesting [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of options     18 months    
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 $ 5.9   $ 5.9    
Period of recognition of share-based compensation expense     1 year 10 months 24 days    
Share-based compensation expense $ 1.2 $ 0.4 $ 3.0 $ 3.6  
Stock Compensation Plans [Member] | 2015 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum aggregate number of shares 350,000   350,000    
Shares available for grant         922,000
Plan description     Subject to adjustments as provided in the 2015 Plan, the maximum aggregate number of shares of the Company’s common stock that may be issued under the 2015 Plan may not exceed the sum of (i) 350 thousand shares plus (ii) any shares (A) remaining available for the grant of awards as of the effective date 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. As of the effectiveness of the 2015 Plan, 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.