Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity [Abstract]
Unrealized Gains on Investments, Beginning Balance			$ 275
Other comprehensive income before reclassification, Unrealized gains on investments			162
Amounts reclassified from AOCI, net of tax			(45)	(29)
Net other comprehensive income (loss)			117
Unrealized Gains on Investments, Ending Balance	392		392
Cumulative Foreign Currency Translation Adjustments, Beginning Balance			42,158
Other comprehensive income before reclassification, Cumulative Foreign Currency Translation Adjustments	5,331	6,229	(6,092)	7,225
Amounts reclassified from AOCI, net of tax, Cumulative Foreign Currency Translation Adjustments
Net other comprehensive income (loss), Accumulated Other Comprehensive Income			(6,092)
Cumulative Foreign Currency Translation Adjustments, Ending Balance	36,066		36,066
Unrecognized Net Actuarial loss and Prior Service Credit, Beginning Balance			(14,968)
Other comprehensive income before reclassifications, Unrecognized Net Actuarial loss and Prior Service Credit
Amounts reclassified from AOCI, net of tax, Unrecognized Net Actuarial loss and Prior Service Credit			91	(78)
Net other comprehensive income (loss), Unrecognized Net Actuarial loss and Prior Service Credit			91
Unrecognized Net Actuarial Loss and Prior Service Credit, Ending Balance	(14,877)		(14,877)
Accumulated Other Comprehensive Income, Beginning Balance			27,465
Other Comprehensive Income before reclassification, Accumulated Other Comprehensive Income			(5,930)
Accumulated Other Comprehensive Income			46
Total other comprehensive (loss) income	5,403	6,204	(5,884)	7,256
Accumulated Other Comprehensive Income, Ending Balance	$ 21,581		$ 21,581