Changes in Accumulated Other Comprehensive Income (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2014	$ (5,773)
Other comprehensive income/(loss) before reclassifications	(2,955)
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income/(loss)	(2,955)
Balance at September 30, 2015	(8,728)
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2014	(33)
Other comprehensive income/(loss) before reclassifications	43
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income/(loss)	43
Balance at September 30, 2015	10
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2014	(5,740)
Other comprehensive income/(loss) before reclassifications	(2,998)
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income/(loss)	(2,998)
Balance at September 30, 2015	$ (8,738)