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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax [Line Items]
Nondeductible executive compensation	$ 14,000,000	$ 11,000,000	$ 13,000,000
Limitations on deductibility of excess annual employee compensation as mandated by health insurance reforms	500,000	500,000	500,000
Net operating losses to carryforward related to prior acquisitions	555,000,000
Valuation allowances on net operating loss carryforwards related to prior acquisitions	$ 77,000,000

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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