Significant Components of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Prepaid expenses	$ 54,821	$ 37,961
Supplies inventory	15,808	15,114
Income taxes receivable	21,065	51,322
Other	55,725	49,802
Total	$ 147,419	$ 154,199