Significant Accounting Policies - Estimated Useful Life (Detail)	12 Months Ended
	Dec. 31, 2013
Leasehold Improvements [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful life	Shorter of lease term or estimated useful life of 3 to 5 years
Minimum [Member] | Computer Equipment and Software [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful life of equipments	2 years
Minimum [Member] | Furniture and Fixtures [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful life of equipments	3 years
Maximum [Member] | Computer Equipment and Software [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful life of equipments	5 years
Maximum [Member] | Furniture and Fixtures [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful life of equipments	13 years