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Employee Retirement and Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 12, 2020 | Mar. 17, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stock options, shares granted |  |  |  |  | 4,140,378 |
Stock options exercised |  |  |  |  | 38,383 |
Stock options forfeited |  |  |  |  | 71,008 |
Stock options, shares expired |  |  |  |  | 2,929,350 |
Stock-based compensation expense |  |  | $ 4,680 | $ 2,272 | $ 8,283 | $ 6,731
Employee Contribution |  |  |  |  | 100.00% |
Percentage of employees contribution matched by the company |  |  |  |  | 4.00% |
Employer Contribution |  |  | $ 300 | $ 300 | $ 900 | $ 1,000
Option Exchange Program [Member] |  |  |  |  |  |
Stock options forfeited |  |  |  |  | 2,896,383 |
Common stock, shares issued under ESPP | 6,664,773 |  |  |  |  |
Option Exchange Program [Member] | Maximum |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 1,000 |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Common stock, shares issued under ESPP |  |  |  |  | 327,085 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share units issued |  | 186,139 |  |  | 193,154 |
Share units granted |  |  |  |  | 3,033,702 |
Share units forfeited |  |  |  |  | 549,493 |
Share units vested |  |  |  |  | 2,146,750 |
Deferred Stock Units [Member] |  |  |  |  |  |
Share units granted |  |  |  |  | 192,702 |
Share units vested |  |  |  |  | 26,508 |
Restricted Stock [Member] |  |  |  |  |  |
Share units vested |  |  |  |  | 25,977 |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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