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Operating Segment Information (Detail) - (Table 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Domestic $ 304,624 $ 278,916
International [Member]
   
Segment Reporting Information [Line Items]    
Domestic 23,242 23,290
Domestic [Member]
   
Segment Reporting Information [Line Items]    
Domestic $ 281,382 $ 255,626