The minimum number of hours that an employee must work to qualify as having worked a year for the reporting entity.

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Bonus expense paid to employees of the reporting entity during the period.

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The increase/(decrease) in the number of shares of common stock available for issuance.

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Amount contributed by the reporting entity to defined contribution plans during the period.

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The maximum amount of cash an employee can received in connection with performance awards.

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The number of defined contribution plans maintained by the reporting entity.

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Number of shares of the reporting entity held as investments by employees in the reporting entity's defined benefit plan.

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The percentage of the employee's annual compensation that is eligible for the company match.

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The percentage of target shares available to vest depending on achievement of performance targets.

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The percentage the defined benefit plan participant vests in the company match based on years employed by the reporting entity assuming they work for at least a minimum stated number of hours in each year.

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The percentage of an employee's investment that can be invested in the reporting entity's common stock.

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The maximum number of stock options available to be awarded expressed as a percentage of the total share reserve.

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The grant date fair value of stock options that vested during the period.

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The number of unissued shares under the reporting entity's previous stock plan that remain available to issue under the reporting entity's current stock plan.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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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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The interest rate used to adjust for the time value of money for the plan.

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Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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The amount of the cost recognized during the period for defined contribution plans.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Maximum amount the employee may contribute to a defined contribution plan.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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-Glossary Financing Activities

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Date the equity-based award expires, in CCYY-MM-DD format.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The highest quantity of shares an employee can purchase under the plan per period.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share instruments newly issued under a share-based compensation plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Employee Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Pension_Plan H	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award limited to percentage of share reserve	75.00%
Maximum number of share to be granted per person	2,000,000
Equity incentive plan termination date	Feb. 13, 2022
Stock options, expected term			5 years
Grant date fair value of stock option vested	$ 700,000
Weighted average grant date fair value of option granted			$ 13.49
Stock options, total intrinsic value	31,900,000	16,400,000	39,900,000
Cash received from stock option exercises	5,780,000	20,324,000	7,136,000
Tax benefit from stock options exercised	9,900,000	2,900,000	14,900,000
Defined benefit plan	148,700,000	134,500,000	154,400,000
Company contribution percent per year per hours worked	20.00%
Amount of hours worked for matched contributions	1,000
Percent of annual compensation match percentage	50.00%
Percent of annual compensation to be matched	3.00%
Defined benefit plan, annual compensation expense maximum	150,000
Defined contribution plan, expenses recognized	15,500,000	12,900,000	10,900,000
Percent of 401(k) that can be invested in common stock	25.00%
Number of share held as investment under 401(k) Plan	1,300,000
Number of contributory defined benefit pension plans in the United Kingdom	2
Defined benefit plan, assumed rate of return	4.47%	4.60%
Expected contribution to pension plans	6,200,000
Employer contribution to defined contribution plan	10,900,000	9,600,000	8,700,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee subscription rate	75.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee subscription rate	1.00%
Equity securities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined benefit plan, target allocation	54.80%
Absolute return strategy fund [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined benefit plan, target allocation	28.30%
Other types of investments [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined benefit plan, target allocation	9.20%
Significant Unobservable Inputs (Level 3) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Significant transfers	0	0
Contingently issuable shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plans, option or stock appreciation right per share	$ 2.25
2012 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of share to be granted per person	3,300,000
Unissued common stock available for issuance	2,205,887
Maximum amount of share to be granted per person	5,000,000
Shares available for future grant	14,717,951
2012 Stock Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of equity incentive and stock option plans	10 years
Pension plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined benefit plan, accumulated benefit obligation	400,200,000	352,200,000
Actuarial loss amortized from AOCL in to net periodic pension cost	2,600,000
Defined benefit plan, assumed rate of return	57.20%
Pension plans [Member] \| Equity securities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined benefit plan, target allocation	7.60%
Pension plans [Member] \| Absolute return strategy fund [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined benefit plan, assumed rate of return	28.10%
Defined benefit plan, target allocation	7.10%
Pension plans [Member] \| Other types of investments [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined benefit plan, target allocation	7.00%
Pension plans [Member] \| Fixed income securities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined benefit plan, target allocation	4.70%
Time Based Vesting [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of equity incentive and stock option plans	3 years
Performance Based Vesting [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of equity incentive and stock option plans	1 year
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of equity incentive and stock option plans	3 years
Shares available for future grant	0	0
Stock option exchange, shares issued	0
Stock option exchange, granted exercise price of common stock	$ 26.50
Stock options, aggregate intrinsic value	14,700,000
Stock options, weighted average remaining contractual life	1 year 10 months 24 days
Stock options, compensation expense	400,000	2,300,000	3,500,000
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, expected term	7 years
Stock Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, expected term	5 years
Non-Vested stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, compensation expense	48,000,000	49,400,000	40,800,000
Stock options, unrecognized estimated compensation cost	$ 113,000,000
Weighted average period of recognition	2 years 8 months 12 days
Class A common stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares reserved for future issuance	10,000,000
Class A common stock [Member] \| 2004 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance	20,785,218
Class A common stock [Member] \| Contingently issuable shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance	30,785,218
Class A common stock [Member] \| 2012 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance	16,000,000
Class A common stock [Member] \| Non-Vested stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested awards, granted shares in period	2,596,830
Class A common stock [Member] \| Non-Vested stock awards [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested awards, granted shares in period	1,613,906	2,353,487	644,635
Class A common stock [Member] \| Non-Vested stock awards [Member] \| Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested awards, granted shares in period	72,580	0	2,803,221
Class A common stock [Member] \| Non-Vested stock awards [Member] \| EBITDA Based Target Performance [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested awards, granted shares in period	329,100
Class A common stock [Member] \| Non-Vested stock awards [Member] \| EPS Based Target Performance [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested awards, granted shares in period	653,824
Class A common stock [Member] \| Non-Vested stock awards [Member] \| Maximum [Member] \| EPS Based Target Performance [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target shares possible	200.00%
Class A common stock [Member] \| Non-Vested stock awards [Member] \| Minimum [Member] \| EPS Based Target Performance [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target shares possible	0.00%
Class A common stock [Member] \| 2004 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plans, common stock outstanding	1,148,749