Long Term Debt (Details) - USD ($)		1 Months Ended	9 Months Ended
	Nov. 03, 2020	Jul. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Oct. 18, 2024	Oct. 17, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Cash and cash equivalents			$ 195,889,000	$ 167,707,000			$ 168,481,000
Repayment of revolving credit facility outstanding balance			61,275,000	40,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, outstanding			0				61,400,000
Repayment of revolving credit facility outstanding balance		$ 61,300,000
Interest paid			$ 3,100,000	$ 5,400,000
Revolving Credit Facility | Australia, Dollars
Debt Instrument [Line Items]
Revolving credit facility, outstanding							$ 3,400,000
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Margin rate	1.50%
Unused commitment fee	0.20%
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Margin rate	2.00%
Unused commitment fee	0.30%
Amended Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 350,000,000
Maximum aggregate incremental term loans	$ 300,000,000
Percentage of consolidated EBITDA to be funded	100.00%
Maximum leverage ratio allowed in order to increase obligation	1.75
Debt financing costs	$ 1,900,000
Debt instrument term	5 years
Maximum total leverage ratio	2.00
Cash and cash equivalents	$ 150,000,000
Minimum coverage ratio	1.75
Minimum department of education financial composite score	1.0
Minimum department of education financial composite score for two consecutive fiscal years	1.5
Amended Credit Facility | Revolving Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity					$ 250,000,000	$ 350,000,000
Amendment to the Credit Facility, Subfacility for Borrowings in Foreign Currencies | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 150,000,000