Long Lived Assets Attributed to Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 57,659	$ 43,921	$ 41,208
UNITED STATES
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	35,900	22,720	20,824
Americas-Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	1,113	1,071	951
Germany
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	17,351	17,294	16,630
Europe-Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	248	115	241
JAPAN
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	599	434	576
Asia And Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 2,448	$ 2,287	$ 1,986