Long Lived Assets Attributed to Geographic Area (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	$ 43,921	$ 41,208	$ 41,692
UNITED STATES
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	22,720	20,824	22,041
Germany
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	17,294	16,630	16,180
Europe-Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	115	241	412
Asia
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,721	2,562	2,076
Americas-Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 1,071	$ 951	$ 983