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Schedule of Dividends Declared (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stockholders' Equity [Abstract]        
Dividends declared $ 12,611 $ 12,536 $ 25,199 $ 25,035
Dividend per share $ 0.25 $ 0.25 $ 0.50 $ 0.50