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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Income Tax [Line Items] |  |  |  |  |
Net deferred income tax assets |  |  |  |  | $ 49.7
Effective rate tax adjustment related to federal tax, amount |  | $ 2.1 |  | $ 2.1 |
Decrease in effective tax rate |  | 12.20% |  | 8.60% |
Decrease in unrecognized tax positions | $ 1.8 |  | $ 1.8 |  |
Interest and penalties |  |  | 1.7 |  |
ASU 2016-09 [Member] |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Effective tax rate adjustment associated with stock compensation | $ 1.5 |  | $ 1.2 |  |
Percentage of increase in effective tax rate associated with stock compensation | 15.60% |  | 5.90% |  |

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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 + Details
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