Impairment Charges - Impairment of Goodwill and Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Impairments Of Goodwill And Long Lived Assets [Line Items]
Goodwill			$ 368,451
Investment in and advances to unconsolidated entities		103,824	41,437
Notes receivable	16,135	22,608	2,857
Total impairment of goodwill and other assets	$ 16,135	$ 126,432	$ 412,745

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.

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+ Details