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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Income Tax Contingency [Line Items] |  |
Gross unrecognized tax benefits | $ 12.0 | $ 14.9
Unrecognized tax benefits that would impact effective tax rate | 12.0 |
Gross unrecognized tax benefits net decrease | 2.9 |
Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
Gross unrecognized tax benefits balance may decrease within the next twelve months | 0.0 |
Maximum [Member] |  |
Income Tax Contingency [Line Items] |  |
Gross unrecognized tax benefits balance may decrease within the next twelve months | $ 1.8 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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