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Other Long-Term Obligations (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Other Liabilities [Line Items]    
Long-term lease obligations, net of current portion $ 25,546 $ 13,231
Deferred proceeds 13,040 635
Deferred compensation 8,100 6,561
Other 1,788 2,942
Other long-term obligations $ 48,474 $ 23,369