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v3.3.1.900

Reconciliation of Federal Statutory Rate to Effective Income Tax Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes | $ 1,194 | $ 3,679 | $ 4,351 | $ 4,198 | $ 242 | $ 2,255 | $ 3,243 | $ 5,398 | $ 13,423 | $ 11,138 | $ 23,014
Expected tax at statutory rate |  |  |  |  |  |  |  |  | 4,564 | 3,787 | 7,825
Adjustments due to: |  |  |  |  |  |  |  |  |  |  |
Difference between U.S. and foreign tax |  |  |  |  |  |  |  |  | (1,910) | (1,471) | (1,228)
State income and franchise taxes |  |  |  |  |  |  |  |  | 563 | 122 | 1,122
Business tax credits |  |  |  |  |  |  |  |  | (115) |  |
Permanent differences |  |  |  |  |  |  |  |  | 118 | (172) | (298)
Change in valuation allowance |  |  |  |  |  |  |  |  | 1,216 | 727 | (509)
Other |  |  |  |  |  |  |  |  | (358) | (25) | 9
Provision (benefit) for income taxes | $ 929 | $ 1,141 | $ 738 | $ 1,269 | $ 640 | $ 789 | $ 418 | $ 1,121 | $ 4,078 | $ 2,968 | $ 6,921
Expected tax at statutory rate |  |  |  |  |  |  |  |  | 34.00% | 34.00% | 34.00%
Adjustments due to: |  |  |  |  |  |  |  |  |  |  |
Difference between U.S. and foreign tax |  |  |  |  |  |  |  |  | (14.20%) | (13.20%) | (5.30%)
State income and franchise taxes |  |  |  |  |  |  |  |  | 4.20% | 1.10% | 4.90%
Business tax credits |  |  |  |  |  |  |  |  | (0.90%) |  |
Permanent differences |  |  |  |  |  |  |  |  | 0.90% | (1.50%) | (1.30%)
Change in valuation allowance |  |  |  |  |  |  |  |  | 9.10% | 6.50% | (2.20%)
Other |  |  |  |  |  |  |  |  | (2.70%) | (0.20%) |
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 30.40% | 26.70% | 30.10%

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