Segment Information - Summary of Assets by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	$ 223,850	$ 248,096
Operating Segments [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	186,486	210,781
Operating Segments [Member] | Malaysia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	37,329	37,280
Operating Segments [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	$ 35	$ 35