Capital Stock - Additional Information (Detail) - USD ($)	Oct. 25, 2019	Sep. 30, 2019	Dec. 31, 2018
Class Of Stock Disclosures [Abstract]
Authorized capital stock		485,000,000.0	485,000,000.0
Common stock, shares authorized		475,000,000	475,000,000
Preferred stock, shares authorized		10,000,000	10,000,000
Preferred stock, shares issued		0	0
Preferred stock, shares outstanding		0	0
Subsequent Event
Class Of Stock Disclosures [Abstract]
Stock repurchase program, authorized amount	$ 100,000,000.0