Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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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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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 4,900,000				$ 6,100,000				$ 4,900,000	$ 6,100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense									1,800,000	700,000	1,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	6,200,000				8,000,000				6,200,000	8,000,000
Income tax expense (benefit)	(65,087,000)us-gaap_IncomeTaxExpenseBenefit	83,484,000us-gaap_IncomeTaxExpenseBenefit	(38,997,000)us-gaap_IncomeTaxExpenseBenefit	11,588,000us-gaap_IncomeTaxExpenseBenefit	(2,892,000)us-gaap_IncomeTaxExpenseBenefit	48,129,000us-gaap_IncomeTaxExpenseBenefit	95,339,000us-gaap_IncomeTaxExpenseBenefit	18,775,000us-gaap_IncomeTaxExpenseBenefit	(9,012,000)us-gaap_IncomeTaxExpenseBenefit	159,351,000us-gaap_IncomeTaxExpenseBenefit	(13,317,000)us-gaap_IncomeTaxExpenseBenefit
Operating Loss Carryforwards	$ 8,900,000us-gaap_OperatingLossCarryforwards								$ 8,900,000us-gaap_OperatingLossCarryforwards
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date									Dec. 31, 2028
Minimum [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year									2011
Minimum [Member] \| State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year									1999
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date									Dec. 31, 2031
Maximum [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year									2014
Maximum [Member] \| State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year									2014