Change in Balances of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (190,865)	$ (133,434)	$ (186,244)	$ (154,303)
Other comprehensive income (loss) before reclassifications	(33,215)	(20,114)	(37,207)	5,381
Amounts reclassified from accumulated other comprehensive income	(2,163)		(2,792)	(2,257)
Out-of-period adjustment		(631)		(3,000)
Net current-period other comprehensive income (loss)	(35,378)	(20,745)	(39,999)	124
Ending Balance	(226,243)	(154,179)	(226,243)	(154,179)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(195,523)	(138,864)	(189,410)	(157,416)
Other comprehensive income (loss) before reclassifications	(34,181)	(22,978)	(40,294)	(1,426)
Out-of-period adjustment				(3,000)
Net current-period other comprehensive income (loss)	(34,181)	(22,978)	(40,294)	(4,426)
Ending Balance	(229,704)	(161,842)	(229,704)	(161,842)
Unrealized Gains (Losses) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	6,046	6,119	4,600	3,808
Other comprehensive income (loss) before reclassifications	966	2,852	3,087	6,807
Amounts reclassified from accumulated other comprehensive income	(2,187)	(627)	(2,862)	(2,271)
Net current-period other comprehensive income (loss)	(1,221)	2,225	225	4,536
Ending Balance	4,825	8,344	4,825	8,344
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,388)	(689)	(1,434)	(695)
Other comprehensive income (loss) before reclassifications		12
Amounts reclassified from accumulated other comprehensive income	24	(4)	70	14
Net current-period other comprehensive income (loss)	24	8	70	14
Ending Balance	$ (1,364)	$ (681)	$ (1,364)	$ (681)