XML 107 R93.htm IDEA: XBRL DOCUMENT v3.10.0.1
Pensions and Other Post-retirement Benefits - Summary of Pension Plan Assets Measured at Fair Value on Recurring Basis by Fair Value Hierarchy (Detail) - Pension Plan - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value $ 443,112 $ 492,677 $ 433,262
Fair Value, Measurements, Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 443,112 492,677  
Plan assets at NAV 118,109 132,828  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 226,406 255,665  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 81,564 86,350  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 17,033 17,834  
Fair Value, Measurements, Recurring | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 259,014 278,606  
Plan assets at NAV 62,027 64,840  
Fair Value, Measurements, Recurring | Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 196,987 213,766  
Fair Value, Measurements, Recurring | Equity securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 0 0  
Fair Value, Measurements, Recurring | Equity securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 0 0  
Fair Value, Measurements, Recurring | Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 109,876 127,128  
Fair Value, Measurements, Recurring | Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 28,312 40,778  
Fair Value, Measurements, Recurring | Fixed income securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 81,564 86,350  
Fair Value, Measurements, Recurring | Fixed income securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 0 0  
Fair Value, Measurements, Recurring | Pooled investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 49,823 60,014  
Plan assets at NAV 49,823 60,014  
Fair Value, Measurements, Recurring | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 17,033 17,834  
Fair Value, Measurements, Recurring | Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 0 0  
Fair Value, Measurements, Recurring | Insurance contracts | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 0 0  
Fair Value, Measurements, Recurring | Insurance contracts | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 17,033 17,834  
Fair Value, Measurements, Recurring | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 7,366 9,095  
Plan assets at NAV 6,259 7,974  
Fair Value, Measurements, Recurring | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 1,107 1,121  
Fair Value, Measurements, Recurring | Cash and cash equivalents | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value 0 0  
Fair Value, Measurements, Recurring | Cash and cash equivalents | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets measured at fair value $ 0 $ 0