Obligations and Funded Status (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Change in plan assets:
Fair value of plan assets at beginning of year	$ 644,931	$ 601,448
Amounts recognized in balance sheet consist of:
Pension liability	(25,069)	(21,295)
Domestic Plan
Change in benefit obligation:
Benefit obligation at beginning of year	568,243	551,231
Service cost			543
Interest cost	26,522	28,454	30,639
Actuarial loss	54,885	22,154
Curtailments		(3)
Benefits paid	(34,289)	(33,593)
Benefit obligation at end of year	615,361	568,243	551,231
Change in plan assets:
Fair value of plan assets at beginning of year	567,373	505,853
Actual return on plan assets	71,182	90,343
Company contributions	1,626	4,770
Benefits paid	(34,289)	(33,593)
Fair value of plan assets at beginning of year	605,892	567,373	505,853
Funded status	(9,469)	(870)
Amounts recognized in balance sheet consist of:
Other Assets	7,981	16,034
Accrued pension liability-current	(1,574)	(1,743)
Pension liability	(15,876)	(15,161)
Accrued benefit liability	(17,450)	(16,904)
Net Liability	(9,469)	(870)
Amounts recognized in accumulated comprehensive loss:
Net actuarial loss	85,984	76,038
Total before taxes	85,984	76,038
Plans with accumulated benefit obligation in excess of plan assets
Projected benefit obligation	615,361	568,243
Accumulated benefit obligation	615,361	568,243
Fair value of plan assets	605,892	567,373
TCN Plan
Change in benefit obligation:
Benefit obligation at beginning of year	40,147	47,190
Service cost		2,740	2,305
Interest cost	1,843	2,379	2,185
Actuarial loss	6,441	6,652
Curtailments		(17,252)
Benefits paid	(422)	(1,562)
Benefit obligation at end of year	48,009	40,147	47,190
Change in plan assets:
Fair value of plan assets at beginning of year	34,075	32,543
Actual return on plan assets	4,886	(906)
Company contributions	500	4,000
Benefits paid	(422)	(1,562)
Fair value of plan assets at beginning of year	39,039	34,075	32,543
Funded status	(8,970)	(6,072)
Amounts recognized in balance sheet consist of:
Accrued pension liability-current	(500)	(2,300)
Pension liability	(8,470)	(3,772)
Accrued benefit liability	(8,970)	(6,072)
Net Liability	(8,970)	(6,072)
Amounts recognized in accumulated comprehensive loss:
Net actuarial loss	6,738	4,525
Total before taxes	6,738	4,525
Plans with accumulated benefit obligation in excess of plan assets
Projected benefit obligation	48,009	40,147
Accumulated benefit obligation	48,009	40,147
Fair value of plan assets	$ 39,039	$ 34,075