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Schedule of Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligation (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jul. 01, 2018
Dec. 31, 2017
Jul. 02, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure                
Actuarial (gain) loss $ (3,500) $ 300 $ (100) $ (3,800) $ (2,800)      
Ending Balance 145,700         $ 145,700    
UNITED STATES                
Defined Benefit Plan Disclosure                
Projected benefit obligation, Beginning of year           363,026 $ 353,616  
Service cost           2,196 2,239 $ 2,302
Interest cost           8,940 13,151 13,630
Actuarial (gain) loss           (30,136) 12,702  
Benefits paid           (14,793) (18,682)  
Retiree annuity purchase           (151,341)    
Liability loss due to settlement           345    
Projected benefit obligation, End of year 178,237     363,026   178,237 363,026 353,616
Beginning Balance           324,506 307,304  
Company contributions           2,587 4,462  
Actual return on plan assets           (16,658) 31,422  
Benefits paid           (14,793) (18,682)  
Retiree annuity purchase           (151,341)    
Ending Balance 144,301     324,506   144,301 324,506 307,304
Funded status (33,936)     (38,520)   (33,936) (38,520)  
Foreign Pension Plans, Defined Benefit                
Defined Benefit Plan Disclosure                
Projected benefit obligation, Beginning of year           39,353 60,738  
Service cost           786 818 761
Interest cost           687 852 1,185
Actuarial (gain) loss           773 262  
Benefits paid           (741) (994)  
Settlements             (28,560)  
Admin expenses paid             (40)  
Non-U.S. currency movement           (1,712) 6,277  
Projected benefit obligation, End of year 39,146     39,353   39,146 39,353 60,738
Beginning Balance           1,307 27,571  
Company contributions           822 883  
Actual return on plan assets           50 737  
Benefits paid           (741) (994)  
Settlements             (28,560)  
Admin expenses paid             (40)  
Non-U.S. currency movement           (38) 1,710  
Ending Balance 1,400     1,307   1,400 1,307 27,571
Funded status (37,746)     (38,046)   (37,746) (38,046)  
Postretirement Benefit Plans                
Defined Benefit Plan Disclosure                
Projected benefit obligation, Beginning of year           6,177 5,510  
Service cost           39 34 37
Interest cost           196 201 218
Actuarial (gain) loss           25 398  
Special termination benefits           3,708 591  
Benefits paid           (889) (557)  
Projected benefit obligation, End of year 9,256     6,177   9,256 6,177 $ 5,510
Beginning Balance              
Company contributions           889 557  
Benefits paid           (889) (557)  
Ending Balance        
Funded status $ (9,256)     $ (6,177)   $ (9,256) $ (6,177)