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Schedule of Dividends Declared (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity [Abstract]        
Dividends declared $ 12,029us-gaap_DividendsCommonStockCash $ 12,396us-gaap_DividendsCommonStockCash $ 37,229us-gaap_DividendsCommonStockCash $ 37,431us-gaap_DividendsCommonStockCash
Dividend per share $ 0.25us-gaap_CommonStockDividendsPerShareDeclared $ 0.25us-gaap_CommonStockDividendsPerShareDeclared $ 0.75us-gaap_CommonStockDividendsPerShareDeclared $ 0.75us-gaap_CommonStockDividendsPerShareDeclared