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Changes in Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Intangible Assets And Goodwill [Line Items]    
Goodwill, beginning of year $ 717,052 $ 727,875
Acquisitions 10,823  
Goodwill, end of year $ 727,875 $ 727,875