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Dividends - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dividends [Line Items]          
Dividends declared and paid, per share   $ 0.10 $ 0.05 $ 0.20 $ 0.15
Dividends declared and paid   $ 9.9 $ 4.9 $ 19.8 $ 14.7
Authorized share price increased $ 0.05        
Quarterly cash dividend $ 0.10