Goodwill and Intangible Assets (Detail) - Carrying Amounts of Amortizable Intangible Assets (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount			$ 22,152
Foreign currency translation adjustments	(241)
Gross carrying amount, after foreign currency translation adjustment	21,911		22,152
Accumulated amortization	(14,376)	[1]	(10,331)	[1]
Finite-lived intangible assets, net	7,535		11,821
Trade Name
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount			6,019
Foreign currency translation adjustments
Gross carrying amount, after foreign currency translation adjustment	6,019		6,019
Accumulated amortization	(4,492)	[1]	(3,531)	[1]
Finite-lived intangible assets, net	1,527		2,488
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount			10,562
Foreign currency translation adjustments	(278)
Gross carrying amount, after foreign currency translation adjustment	10,284		10,562
Accumulated amortization	(7,784)	[1]	(5,896)	[1]
Finite-lived intangible assets, net	2,500		4,666
Content
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount			3,447
Foreign currency translation adjustments	29
Gross carrying amount, after foreign currency translation adjustment	3,476		3,447
Accumulated amortization	(1,161)	[1]	(497)	[1]
Finite-lived intangible assets, net	2,315		2,950
Software
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount			2,124
Foreign currency translation adjustments	8
Gross carrying amount, after foreign currency translation adjustment	2,132		2,124
Accumulated amortization	(939)	[1]	(407)	[1]
Finite-lived intangible assets, net	$ 1,193		$ 1,717

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