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Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Derivative [Line Items]
Proceeds from current swap		$ 14,597	$ 0
Derivative losses included in AOCI		4,100
Currency Swap
Derivative [Line Items]
Derivative instruments outstanding	$ 300,000	300,000		$ 600,000
Proceeds from current swap	(14,600)
Interest receivable	2,200	2,200
Designated as Hedging Instrument [Member] \| Interest rate swaps
Derivative [Line Items]
Total Fair Value, Derivative Assets	$ 8,500	$ 8,500