Changes in Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) ("AOCI") by Component (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			$ 14,960
Other comprehensive income (loss) before reclassification, net of tax			(749)
Amount reclassified from AOCI			(161)
Net current period other comprehensive income (loss)	594	1,278	(910)	1,316
Balance at September 30, 2013	14,050		14,050
Cash Flow Hedge Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012
Other comprehensive income (loss) before reclassification, net of tax			197
Amount reclassified from AOCI			(121)
Net current period other comprehensive income (loss)			76
Balance at September 30, 2013	76		76
Available-for-Sale Securities Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			1,656
Other comprehensive income (loss) before reclassification, net of tax			823
Amount reclassified from AOCI			(40)
Net current period other comprehensive income (loss)			783
Balance at September 30, 2013	2,439		2,439
Foreign currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			13,606
Other comprehensive income (loss) before reclassification, net of tax			(1,769)
Amount reclassified from AOCI
Net current period other comprehensive income (loss)			(1,769)
Balance at September 30, 2013	11,837		11,837
Pension Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			(302)
Other comprehensive income (loss) before reclassification, net of tax
Amount reclassified from AOCI
Net current period other comprehensive income (loss)
Balance at September 30, 2013	$ (302)		$ (302)