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Domestic and Foreign Revenues (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Revenues $ 495,887 $ 540,238 $ 978,409 $ 1,058,823
UNITED STATES
       
Segment Reporting Information [Line Items]        
Revenues 482,300 529,700 953,900 1,035,900
Foreign
       
Segment Reporting Information [Line Items]        
Revenues $ 13,600 $ 10,500 $ 24,500 $ 22,900