Pensions and Postretirement Benefits Plans - Defined Benefit Pension and Other Postretirement Benefits Plans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in benefit obligation:
Projected Benefit Obligation at January 1	$ 1,404,422	$ 1,438,995
Service cost - employer	9,768us-gaap_DefinedBenefitPlanServiceCost	11,887us-gaap_DefinedBenefitPlanServiceCost
Interest cost	62,462us-gaap_DefinedBenefitPlanInterestCost	54,412us-gaap_DefinedBenefitPlanInterestCost
Actuarial (gain)/loss	184,232	(34,606)
Benefits paid	(72,626)us-gaap_DefinedBenefitPlanBenefitsPaid	(73,567)us-gaap_DefinedBenefitPlanBenefitsPaid
Foreign currency translation effect	(25,926)	7,301
Projected Benefit Obligation at December 31	1,562,332	1,404,422
Change in plans' assets:
Fair value of plans' assets at January 1	1,112,314	1,005,574
Actual return on plans' assets	121,412	129,771
Employer contribution	48,200	44,209
Benefits paid	(72,626)us-gaap_DefinedBenefitPlanBenefitsPaid	(73,567)us-gaap_DefinedBenefitPlanBenefitsPaid
Foreign currency translation effect	(20,627)	6,327
Fair value of plans' assets at December 31	1,188,673	1,112,314
Funded status	(373,659)	(292,108)
Amounts recognized in the balance sheets:
Accrued liabilities	(300)	(300)
Postretirement benefits other than pensions	(264,305)	(238,653)
Pension benefits	(373,359)	(291,808)
Pension Benefits - Domestic [Member]
Change in benefit obligation:
Projected Benefit Obligation at January 1	973,276	1,064,070
Service cost - employer	9,760	11,879	9,415
Interest cost	42,842	38,751	43,005
Actuarial (gain)/loss	137,217	(82,219)
Benefits paid	(57,995)	(59,205)
Projected Benefit Obligation at December 31	1,105,100	973,276	1,064,070
Change in plans' assets:
Fair value of plans' assets at January 1	823,790	745,871
Actual return on plans' assets	56,284	101,400
Employer contribution	35,746	35,724
Benefits paid	(57,995)	(59,205)
Fair value of plans' assets at December 31	857,825	823,790	745,871
Funded status	(247,275)	(149,486)
Amounts recognized in the balance sheets:
Accrued liabilities	(300)	(300)
Pension benefits	(246,975)	(149,186)
Pension Benefits - International [Member]
Change in benefit obligation:
Projected Benefit Obligation at January 1	431,146	374,925
Service cost - employer	8	8	725
Interest cost	19,620	15,661	17,106
Actuarial (gain)/loss	47,015	47,613
Benefits paid	(14,631)	(14,362)
Foreign currency translation effect	(25,926)	7,301
Projected Benefit Obligation at December 31	457,232	431,146	374,925
Change in plans' assets:
Fair value of plans' assets at January 1	288,524	259,703
Actual return on plans' assets	65,128	28,371
Employer contribution	12,454	8,485
Benefits paid	(14,631)	(14,362)
Foreign currency translation effect	(20,627)	6,327
Fair value of plans' assets at December 31	330,848	288,524	259,703
Funded status	(126,384)	(142,622)
Amounts recognized in the balance sheets:
Pension benefits	(126,384)	(142,622)
Other Postretirement Benefits - All Plans [Member]
Change in benefit obligation:
Projected Benefit Obligation at January 1	252,866	308,226
Service cost - employer	2,404	3,813	4,161
Interest cost	11,305	10,791	12,532
Actuarial (gain)/loss	24,294	(59,898)
Benefits paid	(12,002)	(10,066)
Projected Benefit Obligation at December 31	278,867	252,866	308,226
Change in plans' assets:
Benefits paid	(12,002)	(10,066)
Benefits paid	0	0
Funded status	(278,867)	(252,866)
Amounts recognized in the balance sheets:
Accrued liabilities	(14,562)	(14,213)
Postretirement benefits other than pensions	$ (264,305)	$ (238,653)

Defined Benefit Plan Benefits Paid Plan Assets

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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-Glossary Projected Benefit Obligation

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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-Glossary Postretirement Benefits

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The increase in the fair value of plan assets from contributions made by the employer.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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This represents the noncurrent liability recognized in the balance sheet that is associated with other postretirement defined benefit plans (excluding pension plans).

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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