Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Additional Information (Detail)

v2.4.0.8
Segment Information - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Property and equipment $ 1,103,212,000   $ 1,103,212,000   $ 1,045,983,000
Canada [Member]
         
Segment Reporting Information [Line Items]          
Percentage of total revenue which were earned in Canada 96.00% 95.00% 97.00% 96.00%  
Foreign Operations [Member]
         
Segment Reporting Information [Line Items]          
Revenues from foreign operations 208,400,000 155,800,000 505,800,000 405,600,000  
Property and equipment $ 169,400,000   $ 169,400,000   $ 151,900,000