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Reclassifications out of Accumulated Other Comprehensive Income - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense $ (6,504) $ (29,581) $ (13,524) $ (41,936)
Tax benefit (expense) (30,206) (19,715) (54,820) (43,988)
Net income 61,053 37,546 119,990 81,512
Interest income 237 237 505 460
Amount Reclassified from Accumulated Other Comprehensive Income [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income (353)   (717)  
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Unrealized losses on cash flow hedges [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax benefit (expense) 221   447  
Net income (353)   (720)  
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Unrealized losses on cash flow hedges [Member] | Interest rate swaps [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense (574)   (1,167)  
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Unrealized gains on available-for-sale securities [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax benefit (expense)      (2)  
Net income      3  
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Unrealized gains on available-for-sale securities [Member] | Short-term investments [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income      $ 5