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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable - Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 525 $ 684 $ 262
Additions- Charges to (Recovery of) Costs and Expenses 80 224 422
Deductions- Write- offs/Costs Incurred 248 383 0
Balance at End of Year 357 525 684
Supplies-Reserve for Slow-Moving Items [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 928 928 721
Additions- Charges to (Recovery of) Costs and Expenses 0 0 379
Deductions- Write- offs/Costs Incurred 913 0 172
Balance at End of Year 15 928 928
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 0 0 0
Deductions- Write- offs/Costs Incurred 970 0 0
Balance at End of Year 0 970 970
Deferred Tax Assets - Valuation Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 1,242 292 298
Additions- Charges to (Recovery of) Costs and Expenses 11,886 950 0
Deductions- Write- offs/Costs Incurred 0 0 6
Balance at End of Year $ 13,128 $ 1,242 $ 292