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Fair Value of Assets Measured on Recurring and Nonrecurring Basis (Parenthetical) (Detail) (USD $)
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12 Months Ended | |||||||
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Mar. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2012
Nonrecurring Items
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||
| Indefinite lived intangible assets, Carrying amount | $ 219,300,000 | |||||||
| Indefinite lived intangible assets, Fair value | 174,242,000 | [1] | ||||||
| Indefinite lived intangible assets, Total loss | 45,052,000 | [1] | ||||||
| Goodwill | 374,434,000 | 388,385,000 | 541,400,000 | |||||
| Goodwill, Fair value | 213,629,000 | [2] | ||||||
| Impairment charges recognized during the period | $ 327,847,000 | [2] | ||||||
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- Details
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the cumulative amount paid in excess of fair value for acquired assets from one or more business combinations, after to the initial recording thereof. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an indefinite-lived intangible asset, other than goodwill, to fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying amount of assets (excluding financial assets) that lack physical substance, excluding goodwill, having a projected indefinite period of benefit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents various capitalized rights and intangible assets, excluding goodwill, having a projected indefinite period of benefit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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