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Stock-Based Compensation - Summary of Restricted Stock Units Activity (Parenthetical) (Detail)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Closing stock price | $ / shares $ 55.69
Percentage of award vested upon completion of acquisition 100.00%
Performance Based Restricted Stock Unit [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total RSUs | shares 84,602