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Schedule of Reconciliation of Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |
U.S. statutory federal tax rate | 35.00% | 35.00% | 35.00%
U.S. transition tax | 28.70% |  |
Impact of rate change on deferred tax | 6.40% |  |
Uncertain tax positions | 1.70% | (2.60%) | 2.20%
Foreign taxes | (16.30%) | 78.00% | (13.80%)
Foreign tax credits | (2.20%) | 49.10% | (2.70%)
U.S. research and development credit | (1.60%) | 15.80% | (3.00%)
Equity compensation | (0.80%) | (2.70%) | 0.60%
Domestic production activities deduction | (0.30%) | 2.30% | (1.00%)
State income taxes, net of federal tax benefit |  | 2.30% | 0.40%
Goodwill impairment |  | (162.10%) |
U.S. alternative minimum tax credit |  | 3.70% |
Inventory cost capitalization |  | 1.80% |
Other, net | 0.30% | 0.50% | 0.70%
Effective tax rate, Total | 50.90% | 21.10% | 18.40%

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