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Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total gross value	$ 133,569	$ 139,591
Less accumulated depreciation	(83,274)	(91,619)
Total net value	50,295	47,972
Land
Property, Plant and Equipment [Line Items]
Total gross value	2,458	2,458
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total gross value	$ 15,515	14,726
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	10 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	40 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total gross value	$ 102,146	113,506
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	15 years
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Total gross value	$ 5,016	4,997
Office furniture, fixtures and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	3 years
Office furniture, fixtures and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	10 years
Automotive equipment
Property, Plant and Equipment [Line Items]
Total gross value	$ 387	491
Automotive equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	3 years
Automotive equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	6 years
Construction in progress
Property, Plant and Equipment [Line Items]
Total gross value	$ 8,047	$ 3,413
Construction in progress | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	3 years
Construction in progress | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	15 years

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Topic 210
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- Definition

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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