Segment Reporting - Schedule of Assets by Geographic Segments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Long-lived assets:
Total	$ 256,602	$ 263,617
United States [Member]
Long-lived assets:
Total	192,066	200,804
United Kingdom [Member]
Long-lived assets:
Total	4,926	5,130
Germany [Member]
Long-lived assets:
Total	56,140	54,245
Asia Including Japan [Member]
Long-lived assets:
Total	$ 3,470	$ 3,438