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Stockholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended
Aug. 01, 2007
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Employees
Dec. 31, 2010
Employees
Dec. 31, 2009
Employees
Feb. 01, 2012
Dividend Declared
Stockholders Equity Note [Line Items]                
Dividend declaration date               Feb. 01, 2012
Dividend per share, declared               $ 0.05
Dividend payment date               Mar. 30, 2012
Dividend record date               Mar. 15, 2012
Amount approved for repurchases under stock buyback program $ 250,000,000              
Treasury stock shares acquired   8,689 8,743 5,715        
Treasury stock repurchased, value   255,000 123,000 79,000        
Amount authorized to purchase the Company's outstanding common stock under the program   113,000,000            
Treasury stock shares acquired         135,068 117,083 114,983  
Purchase price for treasury stock acquired   $ 4,314,000 $ 1,853,000 $ 1,623,000 $ 4,100,000 $ 1,700,000 $ 1,500,000