Investments in debt and equity securities available-for-sale - Debt Securities According to Contractual Terms (Detail) $ in Thousands	Jun. 30, 2016 USD ($)
Amortized costs
In one year or less	$ 45,817
After one year through five years	246,846
After five years through ten years	214,939
After ten years	67,794
Amortized costs, total	575,396
Fair values
In one year or less	45,949
After one year through five years	256,384
After five years through ten years	225,377
After ten years	74,052
Debt securities, fair values total	$ 601,762