Goodwill and Intangible Assets (Detail) - Carrying Amounts of Amortizable Intangible Assets - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount				$ 54,258
Intangibles fully amortized				(13,223)
Minor additions and foreign currency translation impact				479
Gross carrying amount		$ 41,514		41,514
Accumulated amortization	[1],[2]	(14,404)		(14,404)		$ (23,569)
Finite-lived intangible assets, net		27,110		27,110		30,689
Amortization of intangibles		2,107	$ 1,979	4,246	$ 3,258
Trade Name
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount				6,924
Intangibles fully amortized				(6,013)
Minor additions and foreign currency translation impact				(3)
Gross carrying amount		908		908
Accumulated amortization	[1],[2]	(306)		(306)		(6,202)
Finite-lived intangible assets, net		602		$ 602		722
Trade Name | Minimum
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets useful life				2 years
Trade Name | Maximum
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets useful life				5 years
Customer Relationships
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount				$ 27,933
Intangibles fully amortized				(7,210)
Minor additions and foreign currency translation impact				(163)
Gross carrying amount		20,560		20,560
Accumulated amortization	[1],[2]	(5,390)		(5,390)		(11,072)
Finite-lived intangible assets, net		15,170		$ 15,170		16,861
Customer Relationships | Minimum
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets useful life				4 years
Customer Relationships | Maximum
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets useful life				7 years
Content
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount				$ 3,560
Intangibles fully amortized				0
Minor additions and foreign currency translation impact				(77)
Gross carrying amount		3,483		3,483
Accumulated amortization	[1],[2]	(2,663)		(2,663)		(2,246)
Finite-lived intangible assets, net		820		$ 820		1,314
Content | Minimum
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets useful life				1 year 6 months
Content | Maximum
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets useful life				4 years
Software
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount				$ 6,569
Intangibles fully amortized				0
Minor additions and foreign currency translation impact				639
Gross carrying amount		7,208		7,208
Accumulated amortization	[1],[2]	(3,626)		(3,626)		(2,603)
Finite-lived intangible assets, net		3,582		$ 3,582		3,966
Finite-lived intangible assets useful life				3 years
Non-Compete
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount				$ 9,272
Intangibles fully amortized				0
Minor additions and foreign currency translation impact				83
Gross carrying amount		9,355		9,355
Accumulated amortization	[1],[2]	(2,419)		(2,419)		(1,446)
Finite-lived intangible assets, net		$ 6,936		$ 6,936		$ 7,826
Non-Compete | Minimum
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets useful life				4 years
Non-Compete | Maximum
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets useful life				5 years

[1] Aggregate amortization expense related to intangible assets was $2.1 million and $2.0 million for the three months ended June 30, 2015 and 2014, respectively

[2] Intangible assets are being amortized against earnings over the following periods: Trade name—2 to 5 years; Customer relationships—4 to 7 years; Content—1.5 to 4 years; Software—3 years; Non-compete—4 to 5 years.