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Effective Rate for Income from Operations Before Income Taxes (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule Of Effective Tax Rates [Line Items] |  |  |
Effective tax rates | 23.20% | 54.40% | (58.50%)
U.S. |  |  |
Schedule Of Effective Tax Rates [Line Items] |  |  |
Effective tax rates | 36.00% | 64.50% | 249.70%
Foreign |  |  |
Schedule Of Effective Tax Rates [Line Items] |  |  |
Effective tax rates | 10.50% | 57.70% | 24.40%

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