Acquisitions - Additional Information (Detail) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Jun. 18, 2014	Sep. 30, 2015	Dec. 31, 2014	Jun. 30, 2015
Business Acquisition [Line Items]
Accounts receivables assets acquired, fair value	$ 1.6
Gross amount account receivables asset acquired	1.7
Amount due under contract expected to be uncollectible	$ 0.1
Pulpo Media Inc
Business Acquisition [Line Items]
Ownership Interest acquired	100.00%
Business acquisition date		Jun. 18, 2014
Aggregate cash consideration	$ 15.0
Cash acquired	0.7
Fair value of contingent consideration	$ 1.4		$ 1.3	$ 0.1
Additional consideration payment term			90 days
Contingent consideration agreement, payment period	3 years
Contingent consideration arrangements, maximum	$ 3.0
Contingent consideration arrangements, minimum	0.0
Contingent consideration, payment			$ 1.0
Accounts receivables assets acquired, fair value	$ 1.6