Segment Reporting - Schedule of Assets by Geographic Segments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Long-lived assets:
Total	$ 263,039	$ 256,602
United States [Member]
Long-lived assets:
Total	189,912	192,066
United Kingdom [Member]
Long-lived assets:
Total	5,427	4,926
Germany [Member]
Long-lived assets:
Total	64,106	56,140
Asia (Including Japan) [Member]
Long-lived assets:
Total	$ 3,594	$ 3,470