Schedule of Defined Benefit Pension Plans and Other Postretirement Benefits Plan (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in Plan Assets
Fair value of plan assets at December 31	$ 434,569	$ 384,452
Funded Status
Noncurrent assets	121,054	42,818
Noncurrent liabilities	(152,084)	(151,536)
Pension Benefits
Change in Benefit Obligations
Service cost	11,132	9,511	8,674
Interest cost	17,934	19,018	19,531
Actuarial (gains) losses	13,323	6,235	793
Termination benefits	0	(387)	0
Funded Status
Funded status at December 31	(5,790)	(79,354)
Unrecognized transition losses	21	24
Unrecognized prior service cost	374	712
Unrecognized net actuarial losses	116,945	198,169
Net amount recognized	111,550	119,551
Noncurrent assets	121,054	42,818
Current liabilities	(5,518)	(5,021)
Noncurrent liabilities	(121,326)	(117,151)
Net amount recognized	(5,790)	(79,354)
Amounts Recognized in Accumulated Other Comprehensive Income
Net actuarial losses	116,945	198,169
Prior service cost (credit)	374	712
Unrecognized net initial obligation	21	24
Total (before tax effects)	117,340	198,905
Accumulated Benefit Obligations for all Defined Benefit Plans	403,682	414,957
Pension Benefits | Benefit Obligations
Change in Benefit Obligations
Benefit obligations at January 1	463,806	394,269
Service cost	11,132	9,511
Interest cost	17,934	19,018
Participant contributions	136	137
Plan Amendments	(239)	0
Actuarial (gains) losses	(34,248)	58,102
Benefits paid	(19,232)	(17,804)
Settlements	(1,474)	(2,542)
Termination benefits	0	387
Currency translation	2,544	2,728
Benefit obligations at December 31	440,359	463,806
Change in Plan Assets
Settlements	(1,474)	(2,542)
Benefits paid	(19,232)	(17,804)
Currency translation	2,544	2,728
Pension Benefits | Plan Assets
Change in Benefit Obligations
Benefits paid	(16,316)	(15,198)
Settlements	(1,474)	(2,542)
Currency translation	(757)	768
Change in Plan Assets
Fair value of plan assets at January 1	384,452	357,967
Actual return on plan assets	67,391	41,478
Employer contributions	4,053	4,448
Participant contributions	136	137
Settlements	(1,474)	(2,542)
Benefits paid	(16,316)	(15,198)
Reimbursement of German benefits	(2,916)	(2,606)
Currency translation	(757)	768
Fair value of plan assets at December 31	434,569	384,452
Other Benefits
Change in Benefit Obligations
Service cost	687	694	785
Interest cost	1,050	1,265	1,501
Actuarial (gains) losses	552	529	710
Termination benefits	0	0	0
Funded Status
Funded status at December 31	(26,732)	(30,551)
Unrecognized transition losses	0	0
Unrecognized prior service cost	(2,193)	(2,618)
Unrecognized net actuarial losses	6,832	11,492
Net amount recognized	(22,093)	(21,677)
Noncurrent assets	0	0
Current liabilities	(1,695)	(1,882)
Noncurrent liabilities	(25,037)	(28,669)
Net amount recognized	(26,732)	(30,551)
Amounts Recognized in Accumulated Other Comprehensive Income
Net actuarial losses	6,832	11,492
Prior service cost (credit)	(2,193)	(2,618)
Unrecognized net initial obligation	0	0
Total (before tax effects)	4,639	8,874
Accumulated Benefit Obligations for all Defined Benefit Plans	0	0
Other Benefits | Benefit Obligations
Change in Benefit Obligations
Benefit obligations at January 1	30,551	30,425
Service cost	687	694
Interest cost	1,050	1,265
Participant contributions	0	0
Plan Amendments	144	0
Actuarial (gains) losses	(4,107)	(191)
Benefits paid	(1,593)	(1,642)
Settlements	0	0
Termination benefits	0	0
Currency translation	0	0
Benefit obligations at December 31	26,732	30,551
Change in Plan Assets
Settlements	0	0
Benefits paid	(1,593)	(1,642)
Currency translation	0	0
Other Benefits | Plan Assets
Change in Benefit Obligations
Benefits paid	(1,592)	(1,864)
Settlements	0	0
Currency translation	0	0
Change in Plan Assets
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Employer contributions	1,449	1,642
Participant contributions	143	222
Settlements	0	0
Benefits paid	(1,592)	(1,864)
Reimbursement of German benefits	0	0
Currency translation	0	0
Fair value of plan assets at December 31	$ 0	$ 0