Debt - Additional Information (Detail) - USD ($)		3 Months Ended
	Jul. 14, 2017	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Line of Credit Facility [Line Items]
Revolving credit borrowing		$ 144,800,000	$ 131,300,000	$ 139,300,000
Letters of credit outstanding		3,200,000
Other obligations		1,100,000
Financing lease obligations		4,000,000	$ 4,200,000	$ 4,500,000
Minimum [Member]
Line of Credit Facility [Line Items]
Fall of excess borrowing availability		17,500,000
Maximum [Member]
Line of Credit Facility [Line Items]
Fall of excess borrowing availability		$ 31,300,000
Other Obligations [Member]
Line of Credit Facility [Line Items]
Debt instrument maturity year		2023
Debt instrument interest rate		6.11%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, due and payable date	Jul. 14, 2022
Amortization period on real estate component of borrowing base	12 years 6 months
Revolving credit borrowing		$ 144,800,000
Weighted average interest rate		2.50%
Excess committed borrowing availability		$ 55,000,000
Unused commitment fees		0.25%
Fixed charge coverage ratio of credit facility		100.00%
Revolving Credit Facility [Member] | Asset Backed Securities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000