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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |
Company's effective tax rate | 32.20% | 27.50% | 32.10% | 30.60% |
Federal statutory income tax rate |  |  | 35.00% |  |
Increase in gross unrecognized tax benefits | $ 1.8 |  | $ 3.6 |  |
Increase In Unrecognized Tax Benefits That Would Impact Effective Tax Rate | 2.0 |  | 4.2 |  |
Recognized interest expense related to unrecognized tax benefits | 0.4 |  | 1.0 |  |
Interest and penalty related to unrecognized tax benefits recorded | 5.7 |  | 5.7 |  | $ 4.7
Reasonable possible increase in unrecognized tax benefits during the next twelve months | $ (2.7) |  | $ (2.7) |  |

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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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