Other Assets and Other Liabilities - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Current tax receivables and other taxes	$ 38,804	$ 31,767
Prepaid compensation (see Note 14)	60,355	49,650	$ 75,703
Other advances and prepayments	56,595	35,706
Other	72,390	67,376
Total	$ 228,144	$ 184,499