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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Income Tax Contingency [Line Items] |  |
Gross unrecognized tax benefits | $ 15.2 | $ 12.2
Unrecognized tax benefits that would impact effective tax rate | 12.2 |
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=65882285&loc=d3e32718-109319 + Details
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