Goodwill and Other Intangible Assets Net - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets Goodwill [Line Items]
Non-cash goodwill impairment charge	$ 157,900,000	$ 570,800,000
Additional impairment charges	4,200,000	9,100,000
Deferred tax benefit as result of total amount of estimated impairment charges	37,000,000	141,500,000
Equity Method Investments
Intangible Assets Goodwill [Line Items]
Non-cash goodwill impairment charge	17,400,000
Additional impairment charges	$ 3,100,000