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Share-Based Compensation - Additional Information (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Unrecognized compensation cost related to unvested share-based equity awards $ 111,397
Weighted average period of recognition of unvested share-based equity awards 1 year 5 months 15 days
Unrecognized compensation cost related to unvested share-based equity awards, stock options $ 29,706
Unrecognized compensation cost related to unvested share-based equity awards, restricted stock $ 81,691