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Investments - Schedule of Credit Quality of Available-for-sale Debt Securities With Contractual Maturities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 656,762	$ 649,334
Percentage of Total Fair Value	100.00%	100.00%
Comparable Ratings, AAA Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 310,359	$ 317,313
Percentage of Total Fair Value	47.30%	48.90%
Comparable Ratings, AA Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 73,207	$ 129,573
Percentage of Total Fair Value	11.10%	20.00%
Comparable Ratings, A Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 182,479	$ 146,749
Percentage of Total Fair Value	27.80%	22.60%
Comparable Ratings, BBB Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 87,007	$ 51,020
Percentage of Total Fair Value	13.30%	7.80%
Comparable Ratings, BB+ and Below Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 114	$ 1,569
Percentage of Total Fair Value	0.00%	0.20%
Comparable Ratings, No Rating Available [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 3,596	$ 3,110
Percentage of Total Fair Value	0.50%	0.50%

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