Summary of Contract Assets and Deferred Revenue (Detail) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Accounts Receivable Net [Line Items]
Contract assets	[1]	$ 2,425	$ 914
Long-term contract assets	[2]	1,545
Total contract assets		3,970	914
Deferred revenue	[3]	163,525	166,297
Long-term deferred revenue	[4]	6,210	3,706
Total deferred revenue		$ 169,735	$ 170,003

[1] Included in other current assets in the unaudited condensed consolidated balance sheets.

[2] Included in other long-term assets in the unaudited condensed consolidated balance sheets.

[3] On January 1, 2018 the Company adopted the ASC 606 revenue recognition standard and has adjusted prior periods to conform. See Note 2. "New Accounting Pronouncements" for additional information.

[4] Included in other long-term liabilities in the unaudited condensed consolidated balance sheets.