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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended
Jul. 05, 2012
Common Stock Repurchase Program
Jul. 05, 2012
Common Stock Repurchase Program
Senior Notes
Jul. 31, 2012
Business Acquisition Twenty Twelve
Entity
Subsequent Event [Line Items]      
Cash offer of outstanding shares of common stock $ 20.00    
Aggregate value available for tender offer to purchase common stock $ 80.0    
Number of shares of common stock offered for purchase 4,000,000    
Offering cost excluded from total purchase price 0.6    
Increased number of shares underlying the notes   231,480  
Initial purchase price     32.0
Contingent additional payments     $ 33.0
Number of companies acquired     3