Stock-Based Compensation - Additional Information (Detail)	12 Months Ended
Dec. 31, 2017 USD ($) ExecutiveOfficers Option $ / shares shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued \| shares	31,215,000
Allowance for flexibility in awards for every one share \| $ / shares	$ 1.87
Vesting year one	2016
Vesting year two	2017
Vesting year three	2018
Vesting year four	2019
Number of executives that reached retirement age eligibility \| ExecutiveOfficers	2
Term in which the returns are compared to determine number of shares	3 years
Minimum percentage of shares issued under comparative market performance restricted stock units awards	0.00%
Maximum percentage of shares issued under comparative market performance restricted stock units awards	200.00%
Percentage of shares achieved under comparative market performance restricted stock units awards	0.00%
Compensation expense measurement period	3 years
Expected dividend yield	0.00%
Unrecognized compensation cost	$ 152,200,000
Weighted average period of compensation cost	2 years 9 months 18 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares in target award outstanding \| shares	672,530
Modified percentage in performance	200.00%
Number of shares issued at twice the performance percentage \| shares	1,345,060
Fair value of vested restricted share units	$ 76,100,000	$ 52,300,000	$ 118,300,000
Employee Stock Purchase Plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Percentage of base compensation applied towards purchase of common stock	10.00%
Maximum amount of purchase allowed for a participant	$ 25,000
Percentage of fair market value of exercise price	85.00%
Number of exercise price \| Option	2
Minimum percentage of discount not recognized as compensation expense	5.00%
Percentage of discount on common stock	15.00%
Percentage of option held	85.00%
Risk free interest rate	1.20%	0.50%	0.10%
Volatility Factor	28.00%	37.00%	41.00%
Expected dividend yield	0.00%	0.00%	0.00%
Compensation expense related to ESPP	$ 4,800,000	$ 4,600,000	$ 5,100,000
Weighted average expected life	6 months	6 months	6 months
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Allowance for flexibility in awards for every one share.

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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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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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