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Note Employee benefits (Plan assets by fair value hierarchy) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets $ 685,823 $ 767,539  
Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 172,969 138,287  
Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 263,644 291,805  
Equity securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 90,175 123,052  
Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 69,029 103,889  
Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 59,362 74,013  
Mutual Funds      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 3,630 4,510  
Mortgage Backed Securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 11,349 4,539  
Private Equity investments      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 68 182  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 10,573 22,686  
Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 5,024 4,576  
Level 1      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 140,142 199,848  
Level 1 | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 1 | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 1 | Equity securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 90,175 123,052  
Level 1 | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 39,394 54,110  
Level 1 | Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 1 | Mutual Funds      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 1 | Mortgage Backed Securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 1 | Private Equity investments      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 10,573 22,686  
Level 1 | Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 2      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 467,103 473,496  
Level 2 | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 165,832 130,721  
Level 2 | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 256,657 283,947  
Level 2 | Equity securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 2 | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 29,635 49,779  
Level 2 | Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 2 | Mutual Funds      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 3,630 4,510  
Level 2 | Mortgage Backed Securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 11,349 4,539  
Level 2 | Private Equity investments      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 2 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 2 | Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 3      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 5,092 4,758 $ 3,555
Level 3 | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 3 | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 3 | Equity securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 3 | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 3 | Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 3 | Mutual Funds      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 3 | Mortgage Backed Securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 3 | Private Equity investments      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 68 182  
Level 3 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Level 3 | Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 5,024 4,576  
Measured at NAV      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 73,486 89,437  
Measured at NAV | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 7,137 7,566  
Measured at NAV | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 6,987 7,858  
Measured at NAV | Equity securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Measured at NAV | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Measured at NAV | Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 59,362 74,013  
Measured at NAV | Mutual Funds      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Measured at NAV | Mortgage Backed Securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Measured at NAV | Private Equity investments      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Measured at NAV | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Measured at NAV | Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Fair Value of Plan Assets $ 0 $ 0