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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivable - Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 303 $ 357 $ 525
Additions- Charges to (Recovery of) Costs and Expenses 124 (54) 80
Deductions- Write- offs/Costs Incurred 76 0 248
Balance at End of Year 351 303 357
Supplies-Reserve for Slow-Moving Items [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 15 15 928
Additions- Charges to (Recovery of) Costs and Expenses 0 0 0
Deductions- Write- offs/Costs Incurred 0 0 913
Balance at End of Year 15 15 15
Notes Receivable - Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year   0 970
Additions- Charges to (Recovery of) Costs and Expenses     0
Deductions- Write- offs/Costs Incurred     970
Balance at End of Year     0
Deferred Tax Assets - Valuation Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 26,920 13,128 1,242
Additions- Charges to (Recovery of) Costs and Expenses 21,042 13,792 11,886
Deductions- Write- offs/Costs Incurred 2,336 0 0
Balance at End of Year $ 45,626 $ 26,920 $ 13,128