Segment Information (Long-Lived Assets by Geographic Region) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 47,023	$ 53,641
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	35,375	40,347
Europe
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	7,352	8,280
KOREA, REPUBLIC OF
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	655	936
Rest of World
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 3,641	$ 4,078