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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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