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Fair Value Measurements - Valuation of Financial Instruments that are Marked-to-Market on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Trading investments at fair value (cost of $12,551)	$ 16,923	$ 0
Available-for-sale investments	1,996,634	487,669
Fair Value Measurements Recurring
Assets
Trading investments at fair value (cost of $12,551)	16,923	0
Available-for-sale investments	1,996,634	487,669
Derivative instruments	729	715
Total	2,014,286	488,384
Liabilities
Derivative instruments	(287)	(1,164)
Fair Value Measurements Recurring | Level 1
Assets
Trading investments at fair value (cost of $12,551)	0	0
Available-for-sale investments	0	0
Derivative instruments	0	0
Total	0	0
Liabilities
Derivative instruments	0	0
Fair Value Measurements Recurring | Level 2
Assets
Trading investments at fair value (cost of $12,551)	0	0
Available-for-sale investments	1,996,634	487,669
Derivative instruments	729	715
Total	1,997,363	488,384
Liabilities
Derivative instruments	(287)	(1,164)
Fair Value Measurements Recurring | Level 3
Assets
Trading investments at fair value (cost of $12,551)	16,923	0
Available-for-sale investments	0	0
Derivative instruments	0	0
Total	16,923	0
Liabilities
Derivative instruments	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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