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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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	$ 16,000,000
Uncertain tax position, accrued interest	4,500,000	5,200,000
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	9,000,000
Obligations of states and state agencies [Member]
Income Taxes [Line Items]
Operating loss carryforwards	835,000,000
Federal [Member]
Income Taxes [Line Items]
Minimum tax credit carryforward	$ 610,000