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Long-term Debt - Schedule of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Total long term debt	$ 565,312	$ 569,195
Less: current maturities	(23,355)	(24,164)
Long-term debt, less current maturities	541,957	545,031
Senior Notes | 5.75% Senior Notes Due 2028
Debt Instrument [Line Items]
Total long term debt	295,770	295,177
Unamortized debt issuance costs	$ 4,230	4,823
Notes payable Interest rate	5.75%		5.75%
Medium-term Notes | Term Loan Agreement
Debt Instrument [Line Items]
Total long term debt	$ 198,657	198,338
Unamortized debt issuance costs	1,343	1,662
Notes Payable
Debt Instrument [Line Items]
Total long term debt	$ 3,392	2,966
Notes Payable | Minimum
Debt Instrument [Line Items]
Notes payable Interest rate	2.00%
Notes Payable | Maximum
Debt Instrument [Line Items]
Notes payable Interest rate	5.00%
Notes Payable | Vehicle and Equipment
Debt Instrument [Line Items]
Total long term debt	$ 67,493	$ 72,714
Notes Payable | Vehicle and Equipment | Minimum
Debt Instrument [Line Items]
Notes payable Interest rate	1.90%
Notes Payable | Vehicle and Equipment | Maximum
Debt Instrument [Line Items]
Notes payable Interest rate	4.80%

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