Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of stock options granted			0
Number of stock options forfeited			0
Authorized to purchase of common stock under the stock repurchase program	$ 535,000,000.0		$ 535,000,000.0
Repurchase of common stock	100,000	0	100,000	0
Repurchase of common stock, Value	$ 2,673,000		$ 2,673,000
Cumulative repurchase of common stock	16,400,000		16,400,000
Aggregate cost of repurchase of common stock			$ 477,500,000