Leases - Other Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 14,602	$ 13,589
Right-of-use assets obtained in exchange for new operating lease liabilities	5,286	14,530
Series of Individually Immaterial Business Acquisitions
Cash paid for amounts included in the measurement of lease liabilities:
Right-of-use assets obtained in exchange for lease liabilities, business acquisitions	$ 12,074	$ 1,668