Other Current Assets - Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 27,970	$ 21,817
Other receivables	22,456	17,518
Insurance receivable - current portion	5,290	5,290
Workers' compensation deposits - current portion	7,500	7,500
Income taxes receivable	4,873	6,540
Inventory	4,819	4,681
Other	3,611	3,549
Other current assets	$ 76,519	$ 66,895