Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012	$ 677
Other comprehensive loss before reclassifications	(97)
Amounts reclassified from accumulated other comprehensive income
Balance at March 31, 2013	580
Accumulated Translation Adjustment
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012	677
Other comprehensive loss before reclassifications	(97)
Amounts reclassified from accumulated other comprehensive income
Balance at March 31, 2013	$ 580