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Dividends - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dividends [Line Items]    
Dividends declared and paid $ 9.9us-gaap_DividendsCommonStockCash $ 4.9us-gaap_DividendsCommonStockCash
Quarterly cash dividend $ 0.10us-gaap_CommonStockDividendsPerShareDeclared $ 0.05us-gaap_CommonStockDividendsPerShareDeclared