Changes in Benefit Obligations and Plan Assets as Well as Funded Status of Retirement Plans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in plan assets
Fair value of plan assets at end of year	$ 509,877	$ 494,181
Pension Benefits
Change in benefit obligation
Obligation at beginning of year	541,443	491,642
Service cost	13,857	13,428	13,634
Interest cost	28,519	28,200	27,657
Actuarial losses (gains)	52,417	35,243
Plan amendments	(144)	125
Benefits paid	(24,973)	(23,515)
Curtailment gain	(449)
Foreign currency exchange rate changes	(932)	(3,680)
Obligation at end of year	609,738	541,443	491,642
Change in plan assets
Fair value of plan assets at beginning of year	494,181	362,793
Actual return on plan assets	39,782	61,844
Employer contributions	887	93,059
Benefits paid	(24,973)	(23,515)
Fair value of plan assets at end of year	509,877	494,181	362,793
Funded status	(99,861)	(47,262)
Amounts recognized in the consolidated balance sheets
Non-current asset		2,487
Current liabilities	(916)	(839)
Non-current liabilities	(98,945)	(48,910)
Net amount recognized	(99,861)	(47,262)
Amounts recognized in accumulated other comprehensive (loss) income
Net actuarial loss	166,722	121,334
Prior service cost (credit)	6,203	9,170
Net amount recognized	172,925	130,504
Other Postretirement Benefits
Change in benefit obligation
Obligation at beginning of year	54,452	51,170
Service cost	862	918	781
Interest cost	2,441	2,782	2,916
Actuarial losses (gains)	(703)	3,566
Plan amendments	(408)
Benefits paid	(4,436)	(4,887)
Curtailment gain	(1,909)
Participants' contributions	832	903
Obligation at end of year	51,131	54,452	51,170
Change in plan assets
Employer contributions	3,604	3,984
Participants' contributions	832	903
Benefits paid	(4,436)	(4,887)
Funded status	(51,131)	(54,452)
Amounts recognized in the consolidated balance sheets
Current liabilities	(4,311)	(4,629)
Non-current liabilities	(46,820)	(49,823)
Net amount recognized	(51,131)	(54,452)
Amounts recognized in accumulated other comprehensive (loss) income
Net actuarial loss	6,304	9,254
Prior service cost (credit)	(17,688)	(19,864)
Net amount recognized	$ (11,384)	$ (10,610)

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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