Available for sale securities realized gain loss, before tax.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities, net of securities sold in current quarter.

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No definition available.

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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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No definition available.

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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 before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580

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-Name Accounting Standards Codification
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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments in debt and equity securities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Jan. 01, 2017
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Equity securities realized gain loss before tax	$ 3,746
Equity securities investments gross pre-tax unrealized gain (loss)	3,660
Pre tax reclassification of net investment realized gain (loss) into net income		$ 229
Reclassification of net investment realized gain (loss) into net income, net tax		$ 140
Certificates of deposit and other time deposits
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	$ 86
Investment securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ (5,662)	$ 0