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Related-Party Transactions - Schedule of Information Regarding Related Party Transactions (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Related Party Transaction [Line Items]      
Current deferred revenue $ 123,833   $ 131,850
Non-current deferred revenue 14,128   16,392
Customers [Member]      
Related Party Transaction [Line Items]      
Accounts receivable 406   230
Current deferred revenue 486   461
Non-current deferred revenue 40   $ 56
Revenues $ 190 $ 197