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Summary of Activity for Nonvested Restricted Shares (Detail) - Restricted Stock [Member]
3 Months Ended
Jun. 30, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Nonvested at Beginning of Year 300,115
Number of Shares, Granted 93,703
Number of Shares, Vested (25,306)
Number of Shares, Forfeited (15,940)
Number of Shares, Nonvested at End of Year 352,572
Weighted Average Grant Date Fair Value, Beginning of Year | $ / shares $ 78.94
Weighted Average Grant Date Fair Value, Granted | $ / shares 91.58
Weighted Average Grant Date Fair Value, Vested | $ / shares 91.34
Weighted Average Grant Date Fair Value, Forfeited | $ / shares $ 106.24