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Stock-Based Compensation - Summary of Activity Related to RSUs (Detail 1) - RSUs
3 Months Ended
Sep. 30, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at June 30, 2017 834,607
Granted 217,865
Vested (248,671)
Forfeited (12,561)
Unvested at September 30, 2017 791,240
Weighted-average grant date fair value for RSUs | $ / shares $ 151.33