Equity Investments - Additional Information (Detail)	1 Months Ended
Nov. 30, 2016	Dec. 31, 2016
East Gate Media Contents and Technology Fund
Schedule of Investments [Line Items]
Investments percentages accounted under equity method accounting	17.65%
Sale of ownership under agreement	17.65%
Double2 Network Technology Company Limited
Schedule of Investments [Line Items]
Investments percentages accounted under equity method accounting		22.86%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant