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Segment Data (Narrative) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue $ 1,715,797 $ 1,630,034 $ 1,630,154 $ 1,342,548 $ 1,694,367 $ 1,587,522 $ 1,618,097 $ 1,343,058 $ 6,318,533 $ 6,243,044 $ 6,246,884
US Operations [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 4,500,000 4,500,000 4,500,000
Identifiable long-lived assets 2,000,000       2,100,000       2,000,000 2,100,000 2,200,000
Foreign Operations [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 1,800,000 1,700,000 1,700,000
Identifiable long-lived assets $ 682,700       $ 760,500       $ 682,700 $ 760,500 $ 805,200