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

No definition available.

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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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No definition available.

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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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No definition available.

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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 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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Period Worked For Matched Contributions

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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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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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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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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 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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No definition available.

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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 before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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- Definition

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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

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Percentage of vesting of share-based compensation awards.

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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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Employee Benefit Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Pension_Plan shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity incentive plan termination date	Feb. 13, 2022
Stock options, total intrinsic value	$ 1,600,000	$ 13,100,000	$ 7,600,000
Cash received from stock option exercises	915,000	7,525,000	6,203,000
Tax benefit from stock options exercised	400,000	2,300,000	1,200,000
Defined benefit plan	$ 248,100,000	$ 231,900,000	$ 206,300,000
Company contribution percent per year per hours worked	20.00%
Amount of hours worked for matched contributions	1000 hours
Percent of annual compensation match percentage	50.00%	50.00%	50.00%
Percent of annual compensation to be matched	6.00%	5.00%	4.00%
Defined benefit plan, annual compensation expense maximum	$ 150,000	$ 150,000	$ 150,000
Defined contribution plan, expenses recognized	$ 44,300,000	29,000,000	$ 21,300,000
Percent of 401(k) that can be invested in common stock	25.00%
Number of share held as investment under 401(k) Plan \| shares	1,300,000
Number of contributory defined benefit pension plans in the United Kingdom \| Pension_Plan	2
Fair value of plan assets	$ 286,600,000	305,500,000
Benefit obligation	416,900,000	377,500,000
Funded status	130,300,000	72,000,000
Unamortized actuarial loss	$ 209,600,000	$ 132,800,000
Time Based Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Time-vesting awards, portion to be vested per year	25.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant \| shares	0	0	0
Non-Vested Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, compensation expense	$ 63,500,000	$ 74,700,000	$ 59,700,000
Stock options, unrecognized estimated compensation cost	$ 101,000,000
Weighted average period of recognition	1 year 8 months 12 days
Restricted Stock Units [Member] \| Time Based Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant \| shares	1,436,310	1,535,940	1,604,744
Restricted Stock Units [Member] \| Performance Based Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant \| shares	60,098	1,281,267	1,027,786
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee subscription rate	1.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee subscription rate	75.00%
2012 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unissued common stock available for issuance \| shares	2,205,887
Maximum number of share to be granted per person \| shares	3,300,000
Maximum amount of share to be granted per person	$ 5,000,000
2012 Stock Incentive Plan [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant \| shares	10,232,486
Stock option exchange, shares issued \| shares	0
2012 Stock Incentive Plan [Member] \| Minimum [Member] \| Time Based Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of equity incentive and stock option plans	3 years
2012 Stock Incentive Plan [Member] \| Minimum [Member] \| Performance Based Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of equity incentive and stock option plans	1 year
2012 Stock Incentive Plan [Member] \| Minimum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, expected term	5 years
2012 Stock Incentive Plan [Member] \| Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, expected term	7 years
2012 Stock Incentive Plan [Member] \| Maximum [Member] \| Employee Stock Options And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of equity incentive and stock option plans	10 years
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 \| shares	26,076
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 \| shares	16,000,000