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Quarterly Results for 2019 and 2018 - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net change in unrealized gains (losses) of equity securities									$ 23,188	$ (17,169)	$ 0
Net income (loss)	$ (51,073)	$ 20,146	$ 37,293	$ 40,148	$ (6,468)	$ 37,380	$ 46,084	$ 40,055	$ 46,514	$ 117,051	$ 106,935

X

- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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