Credit Agreement - Schedule of Credit Agreement (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Line Of Credit Facility [Line Items]
Letters of credit, borrowing limit under the credit agreement	$ 125,000,000.0
2021 Letter of Credit [Member]
Line Of Credit Facility [Line Items]
Letter of credit, prime rate	3.25%
Line of credit interest rate	2.25%
Credit Agreement [Member] | Letter of Credit [Member] | BMO Harris Bank N.A. ("BMO Harris") [Member]
Line Of Credit Facility [Line Items]
Letters of credit, borrowing limit under the credit agreement		$ 50,000,000.0
Credit Agreement [Member] | Letter of Credit Sublimit [Member] | BMO Harris Bank N.A. ("BMO Harris") [Member]
Line Of Credit Facility [Line Items]
Letters of credit, borrowing limit under the credit agreement		$ 25,000,000.0