Components of Accumulated Other Comprehensive Loss, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accumulated translation adjustment:
Balance at beginning of period	$ (2,804)	$ (5,881)
Translation gain during period	1,125	2,081
Balance at end of period	(1,679)	(3,800)
Accumulated effect of retirement benefit obligations:
Balance at beginning of period	(1,160)
Amounts reclassified from accumulated other comprehensive loss:
Amortization of acturial losses, net of tax of $9	13
Balance at end of period	(1,147)
Accumulated deferred losses on cash flow hedges:
Balance at beginning of period	(272)
Derivative fair value adjustment, net of tax of $9	13
Balance at end of period	$ (259)