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Significant Unobservable Inputs in Estimation of Fair Value (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Fair value of plan assets at beginning of year $ 378,194  
Fair value of plan assets at end of year 370,497 $ 378,194
Real Estate Funds    
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Fair value of plan assets at beginning of year [1] 14,651  
Fair value of plan assets at end of year [1] 17,336 14,651
Hedge Funds, Equity    
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Fair value of plan assets at beginning of year 14,300  
Fair value of plan assets at end of year 500 14,300
Absolute Return Funds    
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Fair value of plan assets at beginning of year 8,000  
Fair value of plan assets at end of year 8,000 8,000
Level 3    
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Fair value of plan assets at beginning of year 154,329 161,578
Total gains or losses (realized and unrealized) 5,378 10,207
Purchases 4,399 440
Issues 736 641
Sales (22,576) (18,357)
Settlements 94 (180)
Fair value of plan assets at end of year 142,360 154,329
Level 3 | Real Estate Funds    
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Fair value of plan assets at beginning of year 14,651 [1] 13,298
Total gains or losses (realized and unrealized) 2,170 954
Issues 736 636
Sales (221) (237)
Fair value of plan assets at end of year [1] 17,336 14,651
Level 3 | Hedge Funds, Equity    
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Fair value of plan assets at beginning of year 52,420 58,176
Total gains or losses (realized and unrealized) 2,452 4,280
Sales (14,290) (10,036)
Fair value of plan assets at end of year 40,582 52,420
Level 3 | Guaranteed Insurance Contracts    
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Fair value of plan assets at beginning of year 9,450 9,594
Total gains or losses (realized and unrealized)   (5)
Purchases 399 440
Issues   5
Sales (65) (584)
Fair value of plan assets at end of year 9,784 9,450
Level 3 | Absolute Return Funds    
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Fair value of plan assets at beginning of year 78,094 80,616
Total gains or losses (realized and unrealized) 756 4,978
Purchases 4,000  
Sales (8,000) (7,500)
Fair value of plan assets at end of year 74,850 78,094
Level 3 | Other Assets And Liabilities And Accrued Income    
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Fair value of plan assets at beginning of year (286) (106)
Settlements 94 (180)
Fair value of plan assets at end of year $ (192) $ (286)
[1] This class includes funds that invest primarily in U.S. commercial real estate.