MediaMission Holding B.V. - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Contributed revenue	$ 10,556	$ 11,267	$ 27,403	$ 27,351
Net income (loss) for acquisition period	(921)	33	(3,303)	(1,528)
MediaMission Holding B.V. [Member]
Business Acquisition [Line Items]
Contributed revenue	167	353	559	580
Net income (loss) for acquisition period	$ (142)	$ (24)	$ (340)	$ (221)