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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation award shares granted in period   109,705      
Share based compensation award granted in period grant-date fair value   $ 1.9      
Share based compensation award vesting period   3 years      
Share based compensation award end date of the a three-year performance period       Dec. 31, 2017  
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 Cash flow return on invested capital, excluding income taxes paid (three-year average).  
Performance Shares | Performance Period 2012 to 2014          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation award shares earned in period         67,239
Share based compensation dividend earned on shares subject to the awards, shares         4,043
Share based compensation performance-based restricted stock awards, vesting date         Jan. 30, 2015
Share based compensation performance-based restricted stock awards, grant date         Jan. 30, 2012
Restricted Stock | Service Based Awards | Employees And Executives          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation award shares granted in period 7,276     269,431  
Share based compensation award granted in period grant-date fair value $ 0.1     $ 4.6  
Share based compensation award vesting period 1 year     1 year  
Restricted Stock | Service Based Awards | Employees And Executives | Annual installment          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation award annual installment vesting rate 25.00%     25.00%  
Restricted Stock | Service Based Awards | Non Employee Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation award shares granted in period     45,619    
Share based compensation award granted in period grant-date fair value     $ 0.8    
Share based compensation award vesting period     1 year