Intangibles and Other Assets - Schedule of Intangibles and Other Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Prepaid income taxes	$ 3,718	$ 0
Other assets	268	265
Gross intangibles and other assets	8,591	4,870
Intangibles and other assets, net	3,997	291
Purchased Patents and Other Purchased Intangibles
Finite-Lived Intangible Assets [Line Items]
Purchased patents and other purchased intangible assets	4,605	4,605
Accumulated amortization of purchased patents and other purchased intangibles	$ (4,594)	$ (4,579)