Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deferred tax impact on net unrealized foreign currency gains	$ 1,942,000
Unrealized gain on investments and reclassifications
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassified accumulated other comprehensive loss into net loss			(600,000)
Pension liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassified accumulated other comprehensive loss into net income (loss)	700,000	300,000	300,000
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassified accumulated other comprehensive loss into net loss	1,500,000
Deferred tax impact on net unrealized foreign currency gains	$ 1,942,000