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Significant Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:      
Reserves and accruals   $ 537 $ 431
Total gross deferred tax assets   537 431
Deferred tax liabilities:      
Prepaid expenses and other   122 (304)
Depreciation, amortization and depletion   (15,164) (10,932)
Total gross deferred tax liabilities   (15,042) (11,236)
Less: current net deferred tax assets     (225)
Noncurrent deferred tax liabilities, net $ (9,822) $ (14,505) $ (11,030)