Share-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2013 share-based_compensation_plan	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans	2
Number of shares authorized	10,600,000
Number of shares available for future issuance	2,700,000
Stock option exercisable life	10 years
Unvested shares, granted	200,000	200,000	300,000
Total intrinsic value of options exercised	$ 34,300,000	$ 23,500,000	$ 21,900,000
Cash received from options exercised	35,306,000	45,771,000	33,064,000
Tax benefit realized for the tax deductions from stock options exercised	12,500,000	8,600,000	8,000,000
Share-based compensation expense	16,993,000	13,102,000	12,076,000
Share based compensation, accrued expenses	2,000,000	2,000,000
Share based compensation, other noncurrent liabilities	1,000,000
Award requisite service period	3 years
Non-Executive [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	3,600,000	2,300,000	800,000
Non-Employee Directors Cliff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of option	1 year
Unvested Share And Unvested Share Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of option	3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested shares, granted	54,065
Total unrecognized compensation cost	1,800,000
Weighted-average period of total unrecognized compensation cost, in years	1 year 1 month 6 days
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	9,100,000
Weighted-average period of total unrecognized compensation cost, in years	1 year 3 months 18 days
Share-based compensation expense	6,268,000	6,292,000	6,958,000
Unvested Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested shares, granted	232,418
Total unrecognized compensation cost	12,300,000
Weighted-average period of total unrecognized compensation cost, in years	1 year
Share-based compensation expense	$ 9,851,000	$ 6,810,000	$ 5,118,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target award	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target award	200.00%
Target payout	100.00%

Number of Share-based Compensation Plans

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Target Award

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Share Based Compensation Arrangement By Share Based Payment Award Target Payout

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- Definition

Stock Option Exercisable Life

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- Definition

Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable after one year (or the operating cycle, if longer).

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No definition available.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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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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-Publisher FASB

-Name Accounting Standards Codification

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

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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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-Topic 230

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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