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Long-Term Debt Senior Notes (Narrative) (Detail) - USD ($) $ in Thousands	7 Months Ended	8 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2020	Mar. 13, 2020	Jan. 23, 2020	Dec. 31, 2019
Debt discount and issuance costs	$ 34,918	$ 34,918	$ 34,918			$ 21,638	[1]
Senior Notes [Member] | Senior Notes due 2029 [Member]
Interest rate	3.50%	3.50%	3.50%			3.50%
Senior Notes [Member] | Senior Notes due 2030 and 2050 [Member]
Debt instrument, redemption price, percentage		100.00%
Debt Instrument, Covenant Compliance			As of September 30, 2020, the Company was in compliance with all applicable covenants in the Indenture.
Senior Notes [Member] | Senior Notes due 2030 and 2050 [Member] | Maximum [Member]
Debt instrument, redemption price, percentage		101.00%
Senior Notes [Member] | Senior Notes due 2030 [Member]
Aggregate principal amount					$ 600,000
Interest rate	2.60%	2.60%	2.60%		2.60%
Maturity date		Feb. 01, 2030
Debt instrument, redemption price, percentage		100.00%
Debt issuance costs	$ 5,435	$ 5,435	$ 5,435
Senior Notes [Member] | Senior Notes due 2050 [Member]
Aggregate principal amount				$ 500,000
Interest rate	3.05%	3.05%	3.05%	3.05%
Maturity date	Apr. 01, 2050
Debt instrument, redemption price, percentage	100.00%
Debt issuance costs	$ 5,682	$ 5,682	$ 5,682
Debt discount	$ 7,375	$ 7,375	$ 7,375
[1] Interest rates represent the interest rates incurred at September 30, 2020

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States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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