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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized gains (losses) on investments	$ 576	$ 110	$ 1,243	$ 281
Income taxes	(21,247)	(16,516)	(37,120)	(32,209)
NET INCOME	33,647	24,704	58,873	47,034
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized gains (losses) on investments	576	110	1,243	281
Income taxes	(220)	(43)	(475)	(108)
NET INCOME	$ 356	$ 67	$ 768	$ 173

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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