Stock-Based Compensation - Schedule of Information Related to Outstanding SOSARS (Detail) - SOSARs - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Shares
Beginning Balance (in shares)	1,082,413,000	1,291,947,000
Granted (in shares)	0	0
Exercised (in shares)	0	(58,460,000)
Canceled / forfeited (in shares)	0	(151,074,000)
Ending Balance (in shares)	1,082,413,000	1,082,413,000
Wtd Avg Exercise Price
Beginning Balance (in dollars per share)	$ 20.40	$ 20.05
Granted (in dollars per share)	0	0
Exercised (in dollars per share)	0	12.85
Canceled / forfeited (in dollars per share)	0	20.25
Ending Balance (in dollars per share)	$ 20.40	$ 20.40