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Summary of Significant Accounting Policies - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 201,392	$ 187,603
Less accumulated depreciation	(77,118)	(70,034)
Property plant and equipment net excluding capitalized cost	124,274	117,569
Construction in progress	2,625	1,601
Property, Plant and Equipment, net	126,899	119,170
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 50,689	50,689
Estimated useful life	Indefinite
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 50,064	43,337
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	$ 29,359	26,862
Estimated useful life	30 years
Furniture, Office and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 33,081	32,118
Furniture, Office and Computer Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Furniture, Office and Computer Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Vehicles and Machinery [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 38,199	$ 34,597
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

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- Definition

Property plant and equipment net excluding capitalized cost.

+ References

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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