Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash	$ 46,134
Other current assets	46,204
Fixed assets	546
Goodwill	79,924
Other assets	300
Total assets acquired	214,754
Other current liabilities	(73,250)
Deferred income tax, net	(5,057)
Other liabilities	(13)
Total liabilities assumed	(78,320)
Net assets acquired	136,434
O'Leary Insurances (O'Leary)
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash	45,441
Other current assets	43,433
Fixed assets	546
Goodwill	84,290
Other assets	42
Total assets acquired	215,030
Other current liabilities	(72,312)
Deferred income tax, net	(5,057)
Other liabilities	(13)
Total liabilities assumed	(77,382)
Net assets acquired	137,648
Other Acquisitions
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash	693
Other current assets	2,771
Goodwill	(4,366)
Other assets	258
Total assets acquired	(276)
Other current liabilities	(938)
Total liabilities assumed	(938)
Net assets acquired	(1,214)
Purchased Customer Accounts
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	40,803
Purchased Customer Accounts | O'Leary Insurances (O'Leary)
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	40,459
Purchased Customer Accounts | Other Acquisitions
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	344
Non-compete Agreements
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	843
Non-compete Agreements | O'Leary Insurances (O'Leary)
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	819
Non-compete Agreements | Other Acquisitions
Fair Value Of Assets And Liabilities Statement [Line Items]
Intangible assets	$ 24