Commitments and Contingencies - Additional Information (Detail)	Sep. 30, 2023 USD ($)
Current Investments | Collateral Pledged
Commitments and Contingencies Disclosure [Line Items]
Investments providing collateral for letters of credit to guarantee insurance claims	$ 57,099,000
Non-Current Investments
Commitments and Contingencies Disclosure [Line Items]
Total non-current investments	95,270,000
Non-Current Investments | Collateral Pledged
Commitments and Contingencies Disclosure [Line Items]
Investments providing collateral for letters of credit to guarantee insurance claims	28,516,000
Revolving Credit Facility
Commitments and Contingencies Disclosure [Line Items]
Letters of credit outstanding	33,492,000
Guarantee Payment of Insurance Claims
Commitments and Contingencies Disclosure [Line Items]
Letters of credit outstanding	$ 77,054,000