Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets net	$ 21,817	$ 1,493
Intangible assets accumulated amortization	14,322	14,050
Acquired software licenses
Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets net	500	400
Intangible assets accumulated amortization	$ 2,700	$ 2,400