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Long Term Debt - Summary of Future Principal Payments, Including in Kind Interest (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt, net	$ 502,183	$ 483,548	$ 480,621
Kind Interest
Debt Instrument [Line Items]
2021		17,000
2022		272,000
2023		277,287
Total debt, net		$ 566,287

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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