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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended				36 Months Ended	224 Months Ended	324 Months Ended
	May 05, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Apr. 30, 2016	Dec. 31, 2020	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cumulative shares repurchased								118,591,000
Average price per share								$ 43.82
Total unrecognized share-based compensation cost		$ 54,000					$ 54,000	$ 54,000
Issuance of shares under stock purchase plan							12,824,000
Total intrinsic value of options exercised		$ 117,000	$ 79,000	$ 92,000
Unrecognized share-based compensation cost, weighted average period		1 year 8 months 12 days
The Amended 2017 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized for grant	5,500,000
Weighted average fair value of award granted during the period		$ 74.00	$ 75.73	$ 69.58
Shares available for granting of awards		3,028,000					3,028,000	3,028,000
The Amended 2017 Plan \| Upper End \| Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of annual equity award grant per participant		$ 600
The Amended 2017 Plan \| Upper End \| Board of Directors Chairman
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of annual equity award grant per participant		$ 800
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period	3 years
Number of common stock issued per unit based award upon vesting		100.00%
Weighted average fair value of award granted during the period		$ 74.13
Shares granted		543,000
Weighted average grant date fair value of shares unvested		$ 73.92	$ 69.54				$ 73.92	$ 73.92
Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average fair value of award granted during the period		$ 72.90
Number of shares, unvested		0					0	0
Shares granted		19,000
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock issued per unit based award upon vesting		100.00%
Number of shares, unvested		210,000					210,000	210,000
Shares granted		95,000	96,000	18,000
Maximum Adjustment Factor		200.00%
Minimum Adjustment Factor		50.00%
Shares issued if minimum performance thresholds are not achieved		0
Weighted average grant date fair value of shares unvested		$ 73.92					$ 73.92	$ 73.92
Employee Stock Option Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized share-based compensation cost		$ 0					$ 0	$ 0
Employee Stock Option Plan \| Upper End
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period					3 years	5 years
Maximum contractual term					10 years
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized for grant		15,305,000					15,305,000	15,305,000
Purchase price percentage of fair market value		85.00%
Amount withheld employee stock purchase plan		$ 23,552					$ 23,552	$ 23,552
Discretionary Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected common stock shares issued and outstanding		160,000,000					160,000,000	160,000,000
Non-Discretionary Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for repurchase		40,000,000					40,000,000	40,000,000
Remaining number of shares authorized for repurchase		0					0	0