Acquisitions - Summary of Purchased Intangible Assets (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jul. 02, 2015	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)		8 years	8 years
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)		8 years	8 years
Trade Name and Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)		8 years	8 years
Content Library [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)		2 years
Qelp [Member] | EMEA [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amount Assigned	$ 6,000
Weighted Average Amortization Period (years)	7 years
Qelp [Member] | Customer Relationships [Member] | EMEA [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amount Assigned	$ 5,400
Weighted Average Amortization Period (years)	7 years
Qelp [Member] | Trade Name and Trademarks [Member] | EMEA [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amount Assigned	$ 100
Weighted Average Amortization Period (years)	3 years
Qelp [Member] | Content Library [Member] | EMEA [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amount Assigned	$ 500
Weighted Average Amortization Period (years)	2 years