Long-Lived Assets by Location (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Long-Lived Assets by Geographical Areas [Line Items]
Net property, plant and equipment	$ 32,338	$ 35,955
UNITED STATES
Long-Lived Assets by Geographical Areas [Line Items]
Net property, plant and equipment	22,679	26,742
Europe
Long-Lived Assets by Geographical Areas [Line Items]
Net property, plant and equipment	5,963	4,866
JAPAN
Long-Lived Assets by Geographical Areas [Line Items]
Net property, plant and equipment	208	419
Asia Pacific And Other Non Us Countries
Long-Lived Assets by Geographical Areas [Line Items]
Net property, plant and equipment	$ 3,488	$ 3,928