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Quarterly Results for 2018 and 2017 - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net change in unrealized gains (losses) of equity securities	$ (8,000)								$ (17,169)	$ 0	$ 0
Net income (loss)	$ (6,468)	$ 37,380	$ 46,084	$ 40,055	$ 36,396	$ 9,964	$ 29,376	$ 31,199	$ 117,051	$ 106,935	$ 99,410

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).

+ References

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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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