Components of net periodic benefit cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Defined Benefit Retirement Plan (Europe)
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 110	$ 72	$ 339	$ 217
Interest cost	2,525	2,835	7,611	8,605
Expected return on assets	(2,797)	(2,935)	(8,435)	(8,910)
Amortization of prior service cost	12	21	38	63
Recognized net actuarial losses	230	149	690	454
Net periodic benefit cost	80	142	243	429
Salary Continuation Plan (SCP)
Defined Benefit Plan Disclosure [Line Items]
Service cost	113	98	339	295
Interest cost	254	284	761	853
Amortization of transition obligation	0	55	0	164
Amortization of prior service cost	12	12	36	36
Amortization of loss	67	93	201	277
Net periodic benefit cost	$ 446	$ 542	$ 1,337	$ 1,625