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Investments in debt and equity securities - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Pre tax reclassification of net investment realized gain (loss) into net income		$ 346
Reclassification of net investment realized gain (loss) into net income, net tax		$ 211
Investments in mutual funds and common stock
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Net Gain (Loss) recognized in Income Statement, before tax	$ 619
Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	3,904
Unrealized Gain on Equity Securities due to changes in Fair Value	$ 3,285
Investment securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ (5,662)

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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