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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 State and Local Jurisdiction [Member] | Dec. 31, 2013 State and Local Jurisdiction [Member] | Sep. 30, 2014 Foreign Tax Authority [Member] | Dec. 31, 2013 Foreign Tax Authority [Member]
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |
Income tax (expense) benefit | $ (8.5) | $ (0.5) |  | $ (18.4) | $ 100.7 |  |  |  |
Effective tax rate | 35.90% | 2.90% |  | 31.60% | (307.00%) |  |  |  |
Valuation Allowance, Deferred Tax Asset, Release Allowed |  |  | 102.4 |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  |  |  |  | 4.1 | 4.7 | 4.7 | 5.1
Unrecognized Tax Benefits, Period Increase (Decrease) | $ (1.1) |  |  |  |  |  |  |  |

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