Subsequent Events - Additional Information (Detail) - Peak Oyun Yazilim Ve Pazarlama Anonim Sirketi (Peak Games) [Member] - Subsequent Event [Member] $ in Millions	Nov. 01, 2017 USD ($)
Subsequent Event [Line Items]
Date of acquisition agreement	Nov. 01, 2017
Business acquisition, cost of acquired entity, cash paid	$ 100.0
Acquisition expected closing date	2017-12