Overview and Summary of Significant Accounting Policies - Additional Information (Detail)	9 Months Ended
Sep. 30, 2013
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Initial offering period	December 2011
Facebook Credits [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Face value per in-game credit	0.10
Revenue recognized per in-game credit	0.07
Percentage of revenue recognized price	70.00%

A description of the time period when the company made its initial offering of a class of securities.

No definition available.

Name:	us-gaap_InitialOfferingPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration