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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | $ 891,783 |  |
Other comprehensive income before reclassifications | (4,042) | $ 8,556 | $ (45,000)
Amounts reclassified from AOCI | 3,331 | 2,082 | 3,080
Remeasurement adjustment related to the Tax Act |  | (5,325) |
Net current period other comprehensive income | (711) | 5,313 | (41,920)
Ending Balance | 986,693 | 891,783 |
Foreign Currency Translation Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (104,037) | (108,481) | (70,561)
Other comprehensive income before reclassifications | (3,046) | 4,444 | (37,920)
Net current period other comprehensive income | (3,046) | 4,444 | (37,920)
Ending Balance | (107,083) | (104,037) | (108,481)
Defined Benefit Pension Plan Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (32,205) | (33,083) | (29,093)
Other comprehensive income before reclassifications | (996) | 4,112 | (7,080)
Amounts reclassified from AOCI | 3,340 | 2,091 | 3,090
Remeasurement adjustment related to the Tax Act |  | (5,325) |
Net current period other comprehensive income | 2,344 | 878 | (3,990)
Ending Balance | (29,861) | (32,205) | (33,083)
Cash Flow Hedge Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | 72 | 81 | 91
Amounts reclassified from AOCI | (9) | (9) | (10)
Net current period other comprehensive income | (9) | (9) | (10)
Ending Balance | 63 | 72 | 81
AOCI Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (136,170) | (141,483) | (99,563)
Ending Balance | $ (136,881) | $ (136,170) | $ (141,483)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121640130&loc=d3e1436-108581 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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