Summary of Significant Accounting Policies - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 225,967	$ 215,083
Less accumulated depreciation	(91,514)	(84,308)
Property plant and equipment net excluding capitalized cost	134,453	130,775
Construction in progress	1,757	272
Property, Plant and Equipment, net	$ 136,210	131,047
Estimated useful life	3 – 10
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 54,429	54,423
Estimated useful life	Indefinite
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 59,249	52,325
Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	20 years
Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	50 years
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 32,306	29,848
Estimated useful life	30 years
Furniture, Office Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 36,882	36,610
Vehicles and Machinery [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 43,101	$ 41,877
Vehicles and Machinery [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Vehicles and Machinery [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	25 years