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Stockholders' Equity - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Apr. 30, 2014
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividend declared and paid per share $ 0.16 $ 0.15  
Aggregate dividend declared for the year $ 3.1 $ 3.4  
Dividend declared per share $ 0.16 $ 0.15 $ 0.16
Dividend payable date Jun. 18, 2014    
Dividend payable record date Jun. 04, 2014    
Authorized to purchase of common stock under the stock repurchase program 410.0    
Additional purchase of common stock     25.0
Repurchase of common Stock 0.8    
Cumulative aggregate cost of repurchase of common stock 29.7    
Cumulative repurchase of common stock 13.2    
Aggregate cost of repurchase of common stock $ 358.8