Basis of Presentation and Summary of Significant Accounting Policies - Accounts Receivable and Allowance for Credit Losses (Detail)		12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization And Significant Accounting Policies Additional Textual [Abstract]
Change in accounting principle, accounting standards update, adopted	true	true	true	true
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate202004Member	us-gaap:AccountingStandardsUpdate201912Member	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020	Jan. 01, 2019
Change in accounting principle, accounting standards update, immaterial effect	true	true	true