Accumulated Other Comprehensive Income (Loss) - Component of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	$ 6
Other comprehensive loss before reclassifications	10
Amounts reclassified from accumulated other comprehensive loss
Net current period other comprehensive income (loss)	10
Ending, balance	16
Unrealized Gains on Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	15
Other comprehensive loss before reclassifications	37
Amounts reclassified from accumulated other comprehensive loss
Net current period other comprehensive income (loss)	37
Ending, balance	52
Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	(9)
Other comprehensive loss before reclassifications	(27)
Amounts reclassified from accumulated other comprehensive loss
Net current period other comprehensive income (loss)	(27)
Ending, balance	$ (36)