Segment Information - Summary of Assets by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 217,373	$ 248,096
Operating Segments [Member] | United States [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	174,226	210,781
Operating Segments [Member] | Malaysia [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	43,118	37,280
Operating Segments [Member] | Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 29	$ 35