Summary of Significant Accounting Policies - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 180,341	$ 170,597
Less accumulated depreciation	(68,854)	(61,410)
Property plant and equipment net excluding capitalized cost	111,487	109,187
Construction in progress	703	566
Property, Plant and Equipment, net	112,190	109,753
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 45,928	40,378
Estimated useful life	Indefinite
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 42,677	42,004
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	$ 26,105	25,520
Estimated useful life	30 years
Furniture, Office and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 35,215	34,053
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
Machinery and Service Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 30,416	$ 28,642
Machinery and Service Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Machinery and Service Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	25 years