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Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 8,983	$ (618)	$ (618)
Other comprehensive income (loss) before reclassification	(15,561)	5,356
Amounts reclassified from accumulated other comprehensive income (loss)	75	(406)
Other comprehensive income (loss)	(15,486)	4,950
Cumulative-effect adjustment	(10,028)
Ending balance	(16,531)	4,332	8,983
Unrealized Gains and Losses on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	8,272	(554)	(554)
Other comprehensive income (loss) before reclassification	(15,189)	5,171
Amounts reclassified from accumulated other comprehensive income (loss)	75	(399)
Other comprehensive income (loss)	(15,114)	4,772
Cumulative-effect adjustment	(9,868)
Ending balance	(16,710)	4,218	8,272
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	711	(64)	(64)
Other comprehensive income (loss) before reclassification	(372)	185
Amounts reclassified from accumulated other comprehensive income (loss)		(7)
Other comprehensive income (loss)	(372)	178
Cumulative-effect adjustment	(160)
Ending balance	$ 179	$ 114	$ 711

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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