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Dividends - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jul. 31, 2014
Subsequent Event
Dividends [Line Items]          
Dividends declared and paid, per share $ 0.05 $ 0.05      
Dividends declared and paid $ 5.0 $ 4.9 $ 9.9 $ 9.8  
Authorized share price increased         $ 0.05
Quarterly cash dividend         $ 0.10
Dividend payable date         Sep. 16, 2014
Dividend record date         Sep. 02, 2014