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Supplemental Cash Flow Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash paid:      
Income taxes $ 339,411 $ 156,075 $ 238,615
Interest 406,987 405,120 351,967
Non-cash investing and financing activities:      
Fixed assets under capital lease obligations $ 28,127 $ 74,035 $ 72,389