Significant Components of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Prepaid expenses	$ 34,368	$ 35,334
Supplies inventory	13,115	14,340
Other	44,269	49,300
Total	$ 91,752	$ 98,974