Segment Reporting - Schedule of Assets by Geographic Segments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Long-lived assets:
Total	$ 257,263	$ 263,617
United States [Member]
Long-lived assets:
Total	196,063	200,804
Asia [Member]
Long-lived assets:
Total	3,388	3,438
United Kingdom [Member]
Long-lived assets:
Total	4,634	5,130
Germany [Member]
Long-lived assets:
Total	$ 53,178	$ 54,245