Schedule II - Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable - Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 827	$ 636	$ 955
Additions- Charges to (Recovery of) Costs and Expenses	134	478	(214)
Deductions- Write- offs/Costs Incurred	135	287	105
Balance at End of Year	826	827	636
Inventory-Reserve for Slow-Moving Items [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	1,389	1,818	1,767
Additions- Charges to (Recovery of) Costs and Expenses	325	249	181
Deductions- Write- offs/Costs Incurred	61	678	130
Balance at End of Year	1,653	1,389	1,818
Supplies-Reserve for Slow-Moving Items [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	721	722	899
Additions- Charges to (Recovery of) Costs and Expenses	379		12
Deductions- Write- offs/Costs Incurred	172	1	189
Balance at End of Year	928	721	722
Notes Receivable - Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	970	970	970
Additions- Charges to (Recovery of) Costs and Expenses
Deductions- Write- offs/Costs Incurred
Balance at End of Year	970	970	970
Deferred Tax Assets - Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	298	273	344
Additions- Charges to (Recovery of) Costs and Expenses		25
Deductions- Write- offs/Costs Incurred	6		71
Balance at End of Year	$ 292	$ 298	$ 273

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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