Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash paid:
Income taxes	$ 156,075	$ 238,615	$ 341,426
Interest	405,120	351,967	405,030
Non-cash investing and financing activities:
Fixed assets under capital lease obligations	$ 74,035	$ 72,389	$ 60,920