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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Taxes Disclosure [Line Items]
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
Non-cash income tax benefit				$ 1.4
Provision for income taxes includes non-cash deferred income tax expense			$ 3.8	$ 7.1
Business interest income, adjusted taxable income				30.00%
Increase (decrease) in unrecognized tax benefits	$ (3.7)		$ (3.7)
ASC 740 | Discontinued Operations
Income Taxes Disclosure [Line Items]
Provision for income taxes includes non-cash deferred income tax expense				$ 5.1
ASC 740 | Continuing Operations
Income Taxes Disclosure [Line Items]
Provision for income taxes includes non-cash deferred income tax expense				$ 2.0

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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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
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-SubTopic 10
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-Paragraph 15
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Income taxes disclosure.

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Non Cash Income Tax Benefit Related to Tax Settlement Payment.

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Tax cuts and jobs act of 2017 effective income tax rate reconciliation, deduction of interest income.

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