Changes in Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended				12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Accumulated Other Comprehensive Income [Line Items]
Balance as of December 31, 2012				$ 1,379	[1]
Total other comprehensive (loss) income	(220)	236	[2]	(642)		(332)	[2]	(433)
Balance as of September 30, 2013	793			793				1,379	[1]
Foreign Currency Translation
Accumulated Other Comprehensive Income [Line Items]
Balance as of December 31, 2012				1,611
Other comprehensive income before reclassifications				(641)
Amounts reclassified from AOCI
Total other comprehensive (loss) income				(641)
Balance as of September 30, 2013	970			970
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income [Line Items]
Balance as of December 31, 2012				(232)
Other comprehensive income before reclassifications
Amounts reclassified from AOCI				55
Total other comprehensive (loss) income				55
Balance as of September 30, 2013	(177)			(177)
Accumulative Other Comprehensive Income
Accumulated Other Comprehensive Income [Line Items]
Balance as of December 31, 2012				1,379
Other comprehensive income before reclassifications				(641)
Amounts reclassified from AOCI				55
Total other comprehensive (loss) income				(586)				(398)
Balance as of September 30, 2013	$ 793			$ 793				$ 1,379

[1] The condensed consolidated balance sheet has been derived from the audited consolidated financial statements at December 31, 2012 but does not include all the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.

[2] Certain amounts shown in the table above have changed as compared to amounts reported in prior periods as noted in Item 1, Financial Statements, Note 1 of Notes to Condensed Consolidated Financial Statements, Reclassifications and Restatements.