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Investments - Schedule of Credit Quality of Investment Available-for-sale Debt Securities With Contractual Maturities or The Issuer of Such Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 644,238	$ 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	$ 126,242	$ 135,237
Percentage of Total Fair Value	19.60%	20.80%
Comparable Ratings, AA Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 250,660	$ 292,496
Percentage of Total Fair Value	38.90%	45.10%
Comparable Ratings, A Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 152,908	$ 134,505
Percentage of Total Fair Value	23.70%	20.70%
Comparable Ratings, BBB Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 109,087	$ 80,566
Percentage of Total Fair Value	16.90%	12.40%
Comparable Ratings, BB+ and Below Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 2,945	$ 2,919
Percentage of Total Fair Value	0.50%	0.40%
Comparable Ratings, No Rating Available [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 2,396	$ 3,611
Percentage of Total Fair Value	0.40%	0.60%

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