Stock-Based Compensation - Schedule of Employee Awards and Non-employee Director Award Plan Activity (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted awards	2,711,066	370,137	3,081,203
Employees Awards | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted awards	1,476,059	370,137	1,846,196
Employees Awards | Market RSU's
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted awards	918,775		918,775
Non-employee Directors Awards | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted awards	316,232		316,232