Segment Information (Long-Lived Assets by Geographic Region) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 53,641	$ 38,900	$ 50,841
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	40,347	27,915	38,543
Europe
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	8,280	2,350	2,949
Republic of Korea
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	936	2,463	4,063
Rest of World
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 4,078	$ 6,172	$ 5,286