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Equity Method Investments - Reconciliation of Net Income to Equity in Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Equity income based on stated ownership percentages	$ 27,266				$ 28,272				$ 27,266	$ 28,272	$ 30,787
Timing of GAAP and other adjustments	(114)				652				(114)	652	(444)
Equity in income of investees	$ 7,905	$ 8,271	$ 4,913	$ 6,063	$ 6,506	$ 7,874	$ 6,862	$ 7,682	$ 27,152	$ 28,924	$ 30,343

X

- Definition

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

+ References

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- Definition

This item represents the entity's ownership percentage in the investee multiplied by the investee's total equity.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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