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Stock Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Dec. 31, 2011
Performance Based Restricted Stock
Performance Period 2009 to 2011
Sep. 30, 2012
Restricted Stock
Service Based Awards
Sep. 30, 2012
Restricted Stock
Service Based Awards
Mar. 31, 2012
Performance-Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation award shares granted in period   0 336,865 134,982
Share based compensation award granted in period grant-date fair value     $ 4.2 $ 1.7
Share based compensation award vesting period from date of grant in installments     1 year  
Share based compensation award annual installment vesting rate     25.00%  
Share based compensation award granted in period weighted average fair value at grant date, per share       $ 12.36
Share based compensation award performance period       3 years
Share based compensation award end date of the three-year performance period       Dec. 31, 2014
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) Cash flow return on invested capital (three-year average)
Share based compensation award shares earned in period 172,751      
Share based compensation dividend earned on shares subject to the awards, shares 25,008      
Share based compensation performance-based restricted stock awards, vesting date Feb. 01, 2012      
Share based compensation performance-based restricted stock awards, grant date Feb. 01, 2009