Pension Benefits - Changes in Benefit Obligation and Fair Value of Benefit Plans Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Change in fair value of plan assets:
Ending balance	$ 97,158	$ 138,876
Funded status deficiency	(24,446)	(12,120)
Amounts recognized in the balance sheets:
Other long-term liabilities	24,446	12,120
Accumulated other comprehensive loss:
Net actuarial losses	(32,060)	(20,922)
Benefit obligation [Member]
Change in benefit obligation:
Beginning balance	150,996	148,490
Service cost	8,800	9,768
Interest cost	4,975	4,974
Contributions by plan participants	292	481
Actuarial (gain) loss	15,982	3,396
Benefits paid	(5,476)	(9,501)
Plan settlements and amendments	(21,235)	(3,126)
Benefit obligations assumed on acquisition	1,083	3,125
Foreign currency exchange rate changes	(33,680)	(6,515)
Other	(133)	(96)
Ending balance	121,604	150,996
Change in fair value of plan assets:
Contributions by plan participants	292	481
Benefits paid	(5,476)	(9,501)
Other	133	96
Fair Value Of Plan Assets [Member]
Change in benefit obligation:
Contributions by plan participants	292	481
Benefits paid	(5,456)	(9,470)
Other	558	425
Change in fair value of plan assets:
Beginning balance	138,876	134,408
Actual return on plan assets	2,849	4,453
Contributions by the employer	12,283	14,609
Contributions by plan participants	292	481
Benefits paid	(5,456)	(9,470)
Plan settlements and amendments	(22,405)	(2,118)
Plan assets assumed on acquisition	998	2,502
Foreign currency exchange rate changes	(29,721)	(5,564)
Other	(558)	(425)
Ending balance	$ 97,158	$ 138,876

Defined Benefit Plan Benefit Obligations Settlements And Amendments

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Defined Benefit Plan Change In Fair Value Of Plan Assets Settlements And Amendments

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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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-Publisher FASB

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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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-Publisher FASB

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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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- 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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The amount of increase in the benefit obligation attributed to business combinations.

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The amount of increase in the plan assets attributed to a business combination.

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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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Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements.

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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 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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