Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financial Instruments [Line Items]
Cumulative-effect adjustment, net of tax, related to the adoption of ASU 2010-11			$ 8,700,000
Asset impairment charge for intangible assets			8,000,000
Estimated fair value of long-term debt, including the current portion	1,630,000,000	1,630,000,000
Carrying amount of long-term debt	1,500,000,000	1,550,000,000
Retained Earnings
Financial Instruments [Line Items]
Cumulative-effect adjustment, net of tax, related to the adoption of ASU 2010-11			8,700,000
Fair Value, Measurements, Nonrecurring | Level 3
Financial Instruments [Line Items]
Asset impairment charge for intangible assets			8,000,000
Remaining fair value of an intangible asset			1,000,000
Asset impairment charge for leasehold improvements			$ 8,000,000