Fair Value of Assets Measured on Recurring and Nonrecurring Basis (Detail) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Mar. 31, 2013 Recurring Items	Dec. 31, 2012 Recurring Items	Dec. 31, 2012 Nonrecurring Items		Mar. 31, 2013 Quoted Prices in Activated Markets for Identical Assets (Level 1) Recurring Items	Dec. 31, 2012 Quoted Prices in Activated Markets for Identical Assets (Level 1) Recurring Items	Dec. 31, 2012 Quoted Prices in Activated Markets for Identical Assets (Level 1) Nonrecurring Items		Mar. 31, 2013 Significant Other Observable Inputs (Level 2) Recurring Items	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) Recurring Items	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) Nonrecurring Items		Mar. 31, 2013 Unobservable Inputs (Level 3) Recurring Items	Dec. 31, 2012 Unobservable Inputs (Level 3) Recurring Items	Dec. 31, 2012 Unobservable Inputs (Level 3) Nonrecurring Items
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Cash and cash equivalents	$ 44,012	$ 84,729			$ 44,012	$ 84,729			$ 0	$ 0			$ 0	$ 0
Total loss Trademarks and Customer Relationship			45,052	[1]
Total loss Goodwill			327,847	[2]
Indefinite lived intangible assets, Fair value			174,242	[1]			0	[1]			0	[1]			174,242	[1]
Goodwill, Fair value			$ 213,629	[2]			$ 0	[2]			$ 0	[2]			$ 213,629	[2]

[1] In 2012 trademarks and customer relationships with a carrying amount of $219.3 million were written down to their fair value of $174.2 million, resulting in an impairment charge of $45.1 million, which was included in earnings for the period.

[2] In 2012 goodwill with a carrying amount of $ 541.4 million was written down to its fair value of $213.6 million, resulting in an impairment charge of $327.8 million, which was included in earnings for the period.