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Total Income Tax Expense Applying U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Computed tax expense at statutory federal rates | $ 6,415 | $ 3,010 | $ 1,536
Increase (decrease) in taxes resulting from: |  |  |
State taxes, net of federal income tax benefit | 702 | 454 | (11)
Domestic production deduction | (1,272) | (179) | 420
Income tax credits | (335) | (662) | (728)
Foreign tax rate differential | (1,587) | (1,590) | (2,159)
Subpart F income | 14 | 9 | 338
Equity investment | 123 | 223 | 10
Stock based compensation | 208 | 244 | 219
State tax rate change | 116 | 185 | (257)
Tax interest | 920 |  |
Other expenses | 236 | 315 | 181
Total income tax expense (benefit) | $ 5,540 | $ 2,009 | $ (451)

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