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Schedule of Dividends Declared (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stockholders' Equity [Abstract]        
Dividends declared $ 11,814 $ 12,611 $ 23,154 $ 25,199
Dividend per share $ 0.25 $ 0.25 $ 0.5 $ 0.5