Acquisitions - Estimated Fair Value of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
LeMagIT [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair value	$ 2,040
LeMagIT [Member] | Developed Websites [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	120 months
Estimated Fair value	1,474
LeMagIT [Member] | Customer Relationship [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	60 months
Estimated Fair value	118
LeMagIT [Member] | Member Database [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	60 months
Estimated Fair value	145
LeMagIT [Member] | Non-compete Agreement [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	36 months
Estimated Fair value	92
LeMagIT [Member] | Trade Name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	96 months
Estimated Fair value	211
Computer Weekly [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair value	1,867
Computer Weekly [Member] | Customer Relationship [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	60 months
Estimated Fair value	825
Computer Weekly [Member] | Member Database [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	60 months
Estimated Fair value	512
Computer Weekly [Member] | Non-compete Agreement [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	24 months
Estimated Fair value	100
Computer Weekly [Member] | Trade Name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	60 months
Estimated Fair value	$ 430