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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |
U.S. federal statutory income tax rate | 21.00% | 21.00%
Non-cash income tax benefit |  | $ 1.4
Provision for income taxes includes non-cash deferred income tax expense | $ 1.0 | $ 5.9
Business interest income, adjusted taxable income | 30.00% |
Increase (decrease) in unrecognized tax benefits | $ (3.7) |

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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Non Cash Income Tax Benefit Related to Tax Settlement Payment. + References No definition available. + Details
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- Definition Tax cuts and jobs act of 2017 effective income tax rate reconciliation, deduction of interest income. + References No definition available. + Details
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