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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |
Effective income tax rate | 30.10% | 25.40% |
Reduction in corporate tax rate | 21.00% |  | 35.00%
Adjustment to income tax expense | $ 5,400,000 |  |
Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Reasonably possible decrease in unrecognized tax benefits | 2,000,000 |  |
Maximum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Reasonably possible decrease in unrecognized tax benefits | $ 22,000,000 |  |

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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=84230637&loc=d3e32718-109319 + Details
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