Obligation and Funded Status (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	$ 601,448	$ 538,396
Amounts recognized in balance sheet consist of:
Pension liability	(21,295)	(52,831)
Domestic Plan
Change in benefit obligation:
Benefit obligation at beginning of year	551,231	552,854
Service cost		543	888
Interest cost	28,454	30,639	31,460
Actuarial loss (gain)	22,154	36,270
Transfers		(25,871)
Divestitures		(6,863)
Curtailments	(3)	(2,258)
Benefits paid	(33,593)	(34,083)
Benefit obligation at end of year	568,243	551,231	552,854
Change in plan assets:
Fair value of plan assets at beginning of year	505,853	416,252
Actual return on plan assets	90,343	47,547
Company contributions	4,770	90,568
Plan merger		(14,431)
Benefits paid	(33,593)	(34,083)
Fair value of plan assets at end of year	567,373	505,853	416,252
Funded status	(870)	(45,378)
Amounts recognized in balance sheet consist of:
Other Assets	16,034
Accrued pension liability-current	(1,743)	(4,797)
Pension liability	(15,161)	(40,581)
Accrued benefit liability	(16,904)	(45,378)
Net Liability	(870)
Amounts recognized in accumulated comprehensive loss:
Net actuarial loss (gain)	76,038	129,830
Total before taxes	76,038	129,830
Plans with accumulated benefit obligation in excess of plan assets
Projected benefit obligation	568,243	551,231
Accumulated benefit obligation	568,243	551,231
Fair value of plan assets	567,373	505,853
TCN Plan
Change in benefit obligation:
Benefit obligation at beginning of year	47,190	37,800
Service cost	2,740	2,305	2,179
Interest cost	2,379	2,185	1,766
Actuarial loss (gain)	6,652	5,879
Curtailments	(17,252)
Benefits paid	(1,562)	(979)
Benefit obligation at end of year	40,147	47,190	37,800
Change in plan assets:
Fair value of plan assets at beginning of year	32,543	25,634
Actual return on plan assets	(906)	2,588
Company contributions	4,000	5,300
Benefits paid	(1,562)	(979)
Fair value of plan assets at end of year	34,075	32,543	25,634
Funded status	(6,072)	(14,647)
Amounts recognized in balance sheet consist of:
Accrued pension liability-current	(2,300)	(4,000)
Pension liability	(3,772)	(10,647)
Accrued benefit liability	(6,072)	(14,647)
Amounts recognized in accumulated comprehensive loss:
Net actuarial loss (gain)	4,525	14,505
Prior service cost (credit)		31
Total before taxes	4,525	14,536
Plans with accumulated benefit obligation in excess of plan assets
Projected benefit obligation	40,147	47,190
Accumulated benefit obligation	40,147	38,165
Fair value of plan assets	$ 34,075	$ 32,543