Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2020	Jan. 31, 2019	Jan. 31, 2018
Stock Repurchase Programs [Line Items]
Stock repurchase program, authorized amount				$ 500,000,000.0
Cumulative repurchases, value	$ 491,202,000	$ 832,356,000	$ 200,304,000
Cumulative repurchases, shares	32.5	21.6	5.8		1.0	10.9
Cumulative repurchases, value	$ 1,323,000,000.0	$ 823,500,000	$ 200,000,000.0		$ 250,000,000.0
Common stock average price	$ 40.68	$ 38.06	$ 34.30	$ 45.89
Maximum [Member] | Scenario, Plan [Member]
Stock Repurchase Programs [Line Items]
Stock repurchase program, authorized amount							$ 1,500,000,000
Cumulative repurchases, value	$ 500,000,000.0