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Quarterly Results for 2017 and 2016 - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Quarterly Financial Information [Line Items]
Percentage of increase in net income	166.50%
Increase in net income during period	$ 22,700
Net income	$ 36,396	$ 9,964	$ 29,376	$ 31,199	$ 13,655	$ 26,882	$ 33,647	$ 25,226	$ 106,935	$ 99,410	$ 106,484
Hurricane [Member]
Schedule of Quarterly Financial Information [Line Items]
Weather event losses					$ 26,600

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- Definition

The charge against earnings in the period for the uninsured portion of a loss from a fire, explosion, or natural disaster (hurricane, earthquake).

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