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RETIREMENT BENEFITS - Changes in Benefit Obligations and Plan Assets as Well as Funded Status of Retirement Plans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in plan assets      
Fair value of plan assets at beginning of year $ 869,070    
Fair value of plan assets at end of year 956,345 $ 869,070  
Pension Benefits      
Change in benefit obligation      
Obligation at beginning of year 855,509 751,625  
Service cost 13,638 12,505 $ 14,238
Interest cost 23,074 28,316 25,316
Actuarial losses 100,839 103,918  
Acquisition 8,930 0  
Plan amendments 0 528  
Benefits paid (41,332) (39,508)  
Participants’ contributions 0 0  
Foreign currency exchange rate changes 10,757 (1,875)  
Obligation at end of year 971,415 855,509 751,625
Change in plan assets      
Fair value of plan assets at beginning of year 869,070 732,502  
Actual return on plan assets 126,249 174,014  
Employer contributions 2,358 2,062  
Participants’ contributions 0 0  
Benefits paid (41,332) (39,508)  
Fair value of plan assets at end of year 956,345 869,070 732,502
Funded status (15,070) 13,561  
Amounts recognized in the consolidated balance sheets      
Non-current assets 125,740 122,552  
Current liabilities (2,674) (2,225)  
Non-current liabilities (138,136) (106,766)  
Net amount recognized (15,070) 13,561  
Amounts recognized in accumulated other comprehensive loss (income)      
Net actuarial loss (gain) 230,058 193,061  
Prior service cost (credit) 974 1,179  
Net amount recognized 231,032 194,240  
Other Postretirement Benefits      
Change in benefit obligation      
Obligation at beginning of year 21,718 19,186  
Service cost 88 80 99
Interest cost 566 759 640
Actuarial losses 1,440 3,477  
Acquisition 0 0  
Plan amendments 0 0  
Benefits paid (1,765) (1,888)  
Participants’ contributions 105 104  
Foreign currency exchange rate changes 0 0  
Obligation at end of year 22,152 21,718 19,186
Change in plan assets      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 1,660 1,784  
Participants’ contributions 105 104  
Benefits paid (1,765) (1,888)  
Fair value of plan assets at end of year 0 0 $ 0
Funded status (22,152) (21,718)  
Amounts recognized in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (1,665) (1,794)  
Non-current liabilities (20,487) (19,924)  
Net amount recognized (22,152) (21,718)  
Amounts recognized in accumulated other comprehensive loss (income)      
Net actuarial loss (gain) (1,344) (3,123)  
Prior service cost (credit) (4,467) (6,405)  
Net amount recognized $ (5,811) $ (9,528)