Business Combinations - Purchase Price Allocation for Current Year Acquisitions and Adjustments Made for Prior Year Acquisitions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Business Combination Separately Recognized Transactions [Line Items]
Cash paid	$ 116,563
Common Stock Issued	4,892
Other payable	(9)
Recorded earn-out payable	14,988
Net assets acquired	136,434
Maximum potential earn- out payable	30,575
O'Leary Insurances (O'Leary)
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	$ 137,648
O'Leary Insurances (O'Leary) | Retail
Business Combination Separately Recognized Transactions [Line Items]
Effective date of acquisition	Jan. 01, 2021
Cash paid	$ 117,408
Common Stock Issued	4,892
Recorded earn-out payable	15,348
Net assets acquired	137,648
Maximum potential earn- out payable	30,575
Other Acquisitions
Business Combination Separately Recognized Transactions [Line Items]
Net assets acquired	(1,214)
Other Acquisitions | Various
Business Combination Separately Recognized Transactions [Line Items]
Cash paid	(845)
Other payable	(9)
Recorded earn-out payable	(360)
Net assets acquired	$ (1,214)