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Stock Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Performance Shares          
Stock Based Compensation [Line Items]          
Share based compensation award shares granted in period     138,191    
Share based compensation award granted in period grant-date fair value     $ 2.4    
Share based compensation award vesting period from date of grant     3 years    
Share based compensation award end date of the a three-year performance period     Dec. 31, 2018    
Performance criteria over the performance period       The actual number of shares earned will be based on the Company's performance related to the following performance criteria over the performance period Operating income growth (three-year compound annual growth rate); Total consolidated revenue growth (three-year compound annual growth rate); and Return on invested capital (three-year average).  
Performance Shares | Performance Period 2013 to 2015          
Stock Based Compensation [Line Items]          
Share based compensation award shares earned in period         96,732
Share based compensation dividend earned on shares subject to the awards, shares         6,990
Share based compensation performance-based restricted stock awards, vesting date         Feb. 05, 2016
Share based compensation performance-based restricted stock awards, grant date         Feb. 05, 2013
Restricted Stock | Service Based Awards | Employees And Executives          
Stock Based Compensation [Line Items]          
Share based compensation award shares granted in period 4,072     271,298  
Share based compensation award granted in period grant-date fair value $ 0.1     $ 4.8  
Share based compensation award vesting period from date of grant 1 year     1 year  
Restricted Stock | Service Based Awards | Employees And Executives | Annual installment          
Stock Based Compensation [Line Items]          
Share based compensation award annual installment vesting rate 25.00%     25.00%  
Restricted Stock | Service Based Awards | Non Employee Directors          
Stock Based Compensation [Line Items]          
Share based compensation award shares granted in period   37,400      
Share based compensation award granted in period grant-date fair value   $ 0.7      
Share based compensation award vesting period from date of grant   1 year