Pensions and Other Postretirement Benefits - Schedule of Defined Benefit Pension Plans and Other Postretirement Benefits Plan (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in Plan Assets
Fair value of plan assets at December 31	$ 445,299	$ 434,569
Funded Status
Noncurrent assets	75,017	121,054
Noncurrent liabilities	(174,598)	(152,084)
Pension Benefits
Change in Benefit Obligations
Benefit obligations at January 1	440,359	463,806
Service cost	9,425	11,132	9,511
Interest cost	19,340	17,934	19,018
Participant contributions	130	136
Plan amendments	(302)	(239)
Actuarial losses (gains)	88,069	(34,248)
Benefits paid	(19,193)	(19,232)
Settlements	(717)	(1,474)
Currency translation	(17,917)	2,544
Benefit obligations at December 31	519,194	440,359	463,806
Change in Plan Assets
Fair value of plan assets at January 1	434,569	384,452
Actual return on plan assets	30,209	67,391
Employer contributions	4,077	4,053
Settlements	(717)	(1,474)
Benefits paid	(16,507)	(16,316)
Reimbursement of German benefits	(2,686)	(2,916)
Currency translation	(3,776)	(757)
Fair value of plan assets at December 31	445,299	434,569	384,452
Funded Status
Funded status at December 31	(73,895)	(5,790)
Unrecognized transition losses	16	21
Unrecognized prior service cost	10	374
Unrecognized net actuarial losses	192,692	116,945
Net amount recognized	118,823	111,550
Noncurrent assets	75,017	121,054
Current liabilities	(5,380)	(5,518)
Noncurrent liabilities	(143,532)	(121,326)
Net amount recognized	(73,895)	(5,790)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial losses	192,692	116,945
Prior service cost (credit)	10	374
Unrecognized net initial obligation	16	21
Total (before tax effects)	192,718	117,340
Accumulated Benefit Obligations for all Defined Benefit Plans	479,764	403,682
Other Benefits
Change in Benefit Obligations
Benefit obligations at January 1	26,732	30,551
Service cost	538	687	694
Interest cost	1,107	1,050	1,265
Participant contributions	259	144
Plan amendments	0	0
Actuarial losses (gains)	(200)	(4,107)
Benefits paid	(1,585)	(1,593)
Settlements	0	0
Currency translation	0	0
Benefit obligations at December 31	26,851	26,732	30,551
Change in Plan Assets
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Employer contributions	1,326	1,449
Settlements	0	0
Benefits paid	(1,585)	(1,593)
Reimbursement of German benefits	0	0
Currency translation	0	0
Fair value of plan assets at December 31	0	0	0
Funded Status
Funded status at December 31	(26,851)	(26,732)
Unrecognized transition losses	0	0
Unrecognized prior service cost	(1,858)	(2,193)
Unrecognized net actuarial losses	6,450	6,832
Net amount recognized	(22,259)	(22,093)
Noncurrent assets	0	0
Current liabilities	(1,457)	(1,695)
Noncurrent liabilities	(25,394)	(25,037)
Net amount recognized	(26,851)	(26,732)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial losses	6,450	6,832
Prior service cost (credit)	(1,858)	(2,193)
Unrecognized net initial obligation	0	0
Total (before tax effects)	4,592	4,639
Accumulated Benefit Obligations for all Defined Benefit Plans	$ 0	$ 0

Defined Benefit Plan, Benefits Paid, Including Non-Participants

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Defined benefit plan, net amount recognized in funded status.

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Defined benefit plan, reimbursement benefits.

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Defined Benefit Plan unrecognized net actuarial losses.

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Defined Benefit Plan unrecognized prior service cost.

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Defined Benefit Plan unrecognized transition losses.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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-Glossary Accumulated Benefit Obligation

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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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Before tax amount of additional minimum pension liability not yet recognized as a net periodic pension 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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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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-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension 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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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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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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-Glossary Accumulated Postretirement 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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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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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 amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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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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-Glossary Service Cost (Component of Net Periodic Pension Cost)

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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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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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-Glossary Current Liabilities

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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