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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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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.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of interest expense accrued for an underpayment of income taxes.

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Income Taxes [Line Items]

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Statutory federal income tax rate	35.00%	35.00%	35.00%
Decrease in liability for unrecognized tax benefits within the next twelve months	$ 16.1
Uncertain tax position, accrued interest	4.6	$ 5.2
Federal
Income Taxes [Line Items]
Operating loss carryforwards	77.6
Tax credit carryforward	1.9
Obligations of states and state agencies
Income Taxes [Line Items]
Operating loss carryforwards	514.3
Tax credit carryforward	$ 3.7