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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective income tax rate |  | 45.90% | 27.80% |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 7.7 | $ 7.7 |  |  |  | $ 7.6
Interest and penalties accrued | 0.5 | 0.5 |  |  |  | $ 0.3
Liability for uncertain tax positions that would impact the effective tax rate if recognized | 5.5 | $ 5.5 |  |  |  |
Cumulative provisional net charge due to change to territorial tax system | $ 15.8 |  |  |  |  |
United States Internal Revenue Service | Earliest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2014 |  |  |  |
United States Internal Revenue Service | Latest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2018 |  |  |  |
Maximum |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax cut and job act measurement period | 1 year |  |  |  |  |
State Jurisdictions | Earliest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2012 |  |  |  |
State Jurisdictions | Latest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2018 |  |  |  |
Foreign Taxing Jurisdictions | Earliest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2006 |  |  |  |
Foreign Taxing Jurisdictions | Latest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2018 |  |  |  |
Scenario Forecast |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
U.S. statutory rate |  |  |  | 21.00% | 28.00% |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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