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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Performance Shares        
Stock Based Compensation And Employee Benefit Plans [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        
Stock Based Compensation And Employee Benefit Plans [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        
Stock Based Compensation And Employee Benefit Plans [Line Items]        
Share based compensation award shares granted in period 9,792   262,155  
Share based compensation award granted in period grant-date fair value $ 0.2   $ 4.4  
Share based compensation award vesting period 1 year   1 year  
Restricted Stock | Service Based Awards | Non Employee Directors        
Stock Based Compensation And Employee Benefit Plans [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      
Restricted Stock | Service Based Awards | Annual installment | Employees And Executives        
Stock Based Compensation And Employee Benefit Plans [Line Items]        
Share based compensation award annual installment vesting rate 25.00%   25.00%