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Significant Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Reserves and accruals $ 568 $ 537
Total gross deferred tax assets 568 537
Deferred tax liabilities:    
Prepaid expenses and other (132) 122
Depreciation and amortization (15,480) (15,164)
Total gross deferred tax liabilities (15,612) (15,042)
Noncurrent deferred tax liabilities, net $ (15,044) $ (14,505)