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Stockholders' Equity - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]        
Dividends declared $ 0 $ 11,811,000 $ 0 $ 34,965,000