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Stockholders Equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period     $ 311,877  
Balance at end of period $ 336,301   336,301  
Currency Translation        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (169,030) $ (182,961) (169,575) $ (172,843)
Other comprehensive income (loss) 402 4,364 947 (5,754)
Balance at end of period (168,628) (178,597) (168,628) (178,597)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (79,553) (77,214) (80,704) (78,257)
Other comprehensive income (loss) 1,144 1,031 2,295 2,074
Balance at end of period (78,409) (76,183) (78,409) (76,183)
Accumulated Defined Benefit Plans Adjustment | OPEB        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (981) (670) (910) (590)
Other comprehensive income (loss) (64) (71) (135) (151)
Balance at end of period (1,045) (741) (1,045) (741)
Accumulated other comprehensive income (loss)        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (249,564) (260,845) (251,189) (251,690)
Other comprehensive income (loss) 1,482 5,324 3,107 (3,831)
Balance at end of period $ (248,082) $ (255,521) $ (248,082) $ (255,521)