Balance Sheet Components - Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred tax assets, net	$ 66,031	$ 62,308
Prepaid expenses	89,784	80,888
Debt issuance costs, net	10,670	6,611
Deposits	48,296	40,893
Restricted cash	11,265	9,706
Derivative instruments	4,110	15,907
Other assets	11,594	9,985
Other assets	$ 241,750	$ 226,298