Income Taxes - Reconciliation of the Federal Statutory Rate to Effective Tax Rate (Detail) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Income Tax Disclosure [Abstract] | |||
| Federal statutory rate | 34.00% | 34.00% | 34.00% |
| State tax, net of federal benefit | (2.10%) | 2.30% | 0.40% |
| Effect of foreign taxes | 1.40% | (1.40%) | (4.10%) |
| Subpart F income | 2.20% | 1.70% | 2.20% |
| Valuation allowance | 0.40% | 0.10% | (38.20%) |
| Foreign deferred tax liability offset | (0.90%) | (1.90%) | 36.10% |
| Manufacturing deduction | (2.80%) | (3.50%) | (2.90%) |
| Research & development tax credits | (1.50%) | (2.40%) | (8.00%) |
| Stock options | 0.60% | 4.30% | 3.60% |
| Uncertain tax positions | 0.60% | (0.20%) | (5.10%) |
| Italian permanent differences | 0.00% | 3.20% | 5.20% |
| Other permanent differences | 1.30% | 3.10% | 3.00% |
| Other | (1.10%) | (1.30%) | (0.20%) |
| Effective tax rate | 32.10% | 38.00% | 26.00% |