Accumulated Other Comprehensive Loss - Changes in AOCL by Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (63,175)	$ (69,418)
Other comprehensive income/(loss) before reclassifications	1,662	(6,410)
Amounts reclassified from AOCL	875	1,047
Other comprehensive income (loss), net	2,537	(5,363)
Ending balance	(60,638)	(74,781)
Gains / (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income/(loss) before reclassifications	894	(3,111)
Amounts reclassified from AOCL	92	(34)
Other comprehensive income (loss), net	986	(3,145)
Ending balance	986	(3,145)
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(46,919)	(58,440)
Amounts reclassified from AOCL	783	1,081
Other comprehensive income (loss), net	783	1,081
Ending balance	(46,136)	(57,359)
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(16,256)	(10,978)
Other comprehensive income/(loss) before reclassifications	768	(3,299)
Other comprehensive income (loss), net	768	(3,299)
Ending balance	$ (15,488)	$ (14,277)