Accounting Policies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Description of 401(k) plan	Restricted cash represents amounts contributed to a 401(k) suspense accounts in connection with the termination of the Company’s qualified pension plan in 2019 and subsequent reversion of excess plan assets to the Company in 2020. The amounts contributed to the 401(k)-suspense account can only be used to pay 401(k) contributions to employees for a period not to exceed the next seven years from its establishment in 2020.