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Reconciliation of Effective Income Tax Rate (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule Of Effective Tax Rates [Line Items] |  |  |
Income tax expense at federal statutory rate | 35.00% | 35.00% | 35.00%
State taxes, net of federal tax effect | 1.70% | (4.30%) | 2.00%
Foreign earnings taxed at different rates | (14.00%) | 2.90% | (18.30%)
Withholding tax | 1.10% | 14.30% | 9.70%
Foreign tax credit | (0.30%) | (9.60%) | (5.40%)
Other international components | 0.80% | 0.80% | 3.40%
Change in valuation allowance | (0.10%) | 21.10% | (0.80%)
Deferred tax adjustments and rate changes | (0.10%) | (4.90%) | (2.80%)
Meals and entertainment | 0.30% | 5.90% | 4.50%
Other tax credits | 0.10% | 2.50% | 2.50%
Subpart F income | 0.50% | 4.00% | 2.40%
Research and development tax credit | (0.60%) | (13.70%) | (12.60%)
Other permanent differences | (1.20%) | (1.60%) | 0.80%
Release of unrecognized tax benefits | 0.00% | 0.00% | (86.00%)
Total | 23.20% | 54.40% | (58.50%)
Non-deductible Officers Compensation |  |  |
Schedule Of Effective Tax Rates [Line Items] |  |  |
Other tax credits | 0.00% | 2.00% | 7.10%

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