Investments and other assets - Narrative (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Increase in the fair value of the debt security	$ 20,800
Equity investments, impairment loss		$ 9,200
Available-for-sale debt security	23,800	$ 3,000
One Of Investments
Schedule of Equity Method Investments [Line Items]
Recorded gains	1,900
Different investment
Schedule of Equity Method Investments [Line Items]
Equity investments, impairment loss	$ 1,900