Stock-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in Period (in shares)		0
Stock options outstanding (in shares)	150,000
Stock options exercisable (in shares)	150,000
Stock options, aggregate intrinsic value	$ 2.6
Stock options, weighted average exercise price (in USD per share)	$ 15.43
Stock options, weighted average remaining contractual term (years)	9 months
Consecutive trading days, vesting threshold	90 days
Granted (in shares)	969,000
Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in Period (in shares)	0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of RSUs vested during the year	$ 4.3
Aggregate intrinsic value of RSUs vested and expected to vest	$ 68.8
Weighted average period of recognition of unrecognized compensation cost	1 year
Performance-based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0
Market-based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0
Market-based stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0
Minimum \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Maximum \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years

Share-based Compensation Arrangement by Share-based Payment Award, Consecutive Trading Days, Vesting Threshold

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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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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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