Schedule Presents Net Current and Net Long-Term Deferred Tax Assets and Liabilities by Tax Jurisdiction (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Current	$ 4,499	$ 2,178
Deferred Tax Assets, Long-term	474	798
Deferred Tax Liabilities, Current	26	32
Deferred Tax Liabilities, Long-term	3,902	5,240
Federal [Member]
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Current	3,862	1,832
Deferred Tax Assets, Long-term	0	0
Deferred Tax Liabilities, Current	0	0
Deferred Tax Liabilities, Long-term	2,935	4,491
State [Member]
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Current	348	58
Deferred Tax Assets, Long-term	0	0
Deferred Tax Liabilities, Current	0	0
Deferred Tax Liabilities, Long-term	205	406
Foreign [Member]
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Current	289	288
Deferred Tax Assets, Long-term	474	798
Deferred Tax Liabilities, Current	26	32
Deferred Tax Liabilities, Long-term	$ 762	$ 343