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Total Income Tax Expense Applying U.S. Federal Income Tax Rate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components Of Income Tax Expense Benefit [Line Items]      
Computed tax expense at statutory federal rates $ 3,010 $ 1,536 $ 18,678
Increase (decrease) in taxes resulting from:      
State taxes, net of federal income tax benefit 454 (11) 1,983
Domestic production deduction (179) 420 (1,142)
Income tax credits (662) (728) (724)
Foreign tax rate differential (1,590) (2,159) (1,459)
Subpart F income 9 338  
Equity Investment 223 10 345
Stock Based Compensation 244 219 461
State Tax Rate Change 185 (257) 83
Unrecognized tax benefits 168 32 419
Foreign Tax Gross Up 83 10 24
Meals and Entertainment 73 76 103
Other expenses (9) 63 145
Total income tax expense (benefit) $ 2,009 $ (451) $ 18,916