Schedule of Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure
Actuarial loss (gain)	$ (23,320)	$ (13,564)	$ 1,351
Settlement	(52,000)
Fair value of plan assets, beginning balance	339,580
Settlement	(52,000)
Fair value of plan assets, ending balance	302,899	339,580
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year	390,278	337,796
Service cost	2,787	2,735	3,655
Interest cost	15,670	17,466	17,716
Actuarial loss (gain)	31,912	54,248
Benefits paid	(65,650)	(13,260)
Curtailment		210
Settlement		(7,637)
Transfers		(564)
Non-U.S. currency movement	1,501	(716)
Projected benefit obligation, End of year	376,498	390,278	337,796
Fair value of plan assets, beginning balance	339,580	294,988
Company contributions	3,306	10,169
Plan participants' contributions	108	51
Actual return on plan assets	24,621	55,345
Benefits paid	(65,650)	(13,260)
Settlement		(7,637)
Non-U.S. currency movement	934	(76)
Fair value of plan assets, ending balance	302,899	339,580	294,988
Funded status	(73,599)	(50,698)
Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year	12,793	12,896
Service cost	67	59	57
Interest cost	437	539	668
Actuarial loss (gain)	82	981
Benefits paid	(1,472)	(1,682)
Plan amendment
Projected benefit obligation, End of year	11,907	12,793	12,896
Company contributions	1,472	1,682
Benefits paid	(1,472)	(1,682)
Funded status	$ (11,907)	$ (12,793)