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Segment Information - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Segment
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | Segment     2    
Property and equipment $ 1,125,501   $ 1,125,501   $ 1,099,574
Canada [Member]          
Segment Reporting Information [Line Items]          
Percentage of foreign revenues 83.00% 83.00% 85.00% 81.00%  
Foreign Operations [Member]          
Segment Reporting Information [Line Items]          
Revenues $ 342,600 $ 523,700 $ 1,240,000 $ 1,370,000  
Property and equipment $ 337,200   $ 337,200   $ 372,900