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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts Receivable - Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 684 $ 262 $ 304
Additions- Charges to (Recovery of) Costs and Expenses 224 422 (40)
Deductions- Write- offs/Costs Incurred 383   2
Balance at End of Year 525 684 262
Supplies-Reserve for Slow-Moving Items [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 928 721 722
Additions- Charges to (Recovery of) Costs and Expenses   379  
Deductions- Write- offs/Costs Incurred   172 1
Balance at End of Year 928 928 721
Notes Receivable - Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 970 970 970
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 292 298 273
Additions- Charges to (Recovery of) Costs and Expenses 950   25
Deductions- Write- offs/Costs Incurred   6  
Balance at End of Year $ 1,242 $ 292 $ 298