Summary of Impairment Charge (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill And Long Lived Assets [Line Items]
Impairment of goodwill and long-lived assets	$ 31,977	$ 125,703
Platforms and applications
Goodwill And Long Lived Assets [Line Items]
Goodwill and long-lived assets, carrying value	65,406	65,406
Goodwill and long-lived assets, fair value	33,429
Impairment of goodwill and long-lived assets	31,977
Platforms and applications | Goodwill – platforms and applications
Goodwill And Long Lived Assets [Line Items]
Goodwill and long-lived assets, carrying value		36,121
Goodwill and long-lived assets, fair value	27,912
Impairment of goodwill and long-lived assets	8,209
Platforms and applications | Property and equipment, including capitalized software for internal use
Goodwill And Long Lived Assets [Line Items]
Goodwill and long-lived assets, carrying value		18,082
Goodwill and long-lived assets, fair value	5,517
Impairment of goodwill and long-lived assets	12,565
Platforms and applications | Software development costs
Goodwill And Long Lived Assets [Line Items]
Goodwill and long-lived assets, carrying value		9,270
Impairment of goodwill and long-lived assets	9,270
Platforms and applications | Acquired intangible assets
Goodwill And Long Lived Assets [Line Items]
Goodwill and long-lived assets, carrying value		599
Impairment of goodwill and long-lived assets	599
Platforms and applications | Other assets
Goodwill And Long Lived Assets [Line Items]
Goodwill and long-lived assets, carrying value		1,334
Impairment of goodwill and long-lived assets	$ 1,334