Note Employee benefits (Changes in level 3 assets measured at fair value) (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
Assets, Fair Value Disclosure [Abstract] | ||
Fair value of plan assets at beginning of year | $ 697,240 | |
Fair value of plan assets at end of year | 644,414 | $ 697,240 |
Level 3 | ||
Assets, Fair Value Disclosure [Abstract] | ||
Fair value of plan assets at beginning of year | 2,103 | 2,562 |
Actual return on plan assets | 0 | (459) |
Purchases, sales, issuance, settlements, paydowns and maturities (net) | (10) | 0 |
Fair value of plan assets at end of year | $ 2,093 | $ 2,103 |