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Acquisitions - Pro Forma Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Business Acquisition, Pro Forma Information [Abstract]    
Total revenues pro forma $ 1,370,594 $ 2,624,039
Net income pro forma $ 357,654 $ 642,891