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Share based compensation, shares issued based on percentage of performance achieved.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Subparagraph (SAB Topic 14.F)
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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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No definition available.

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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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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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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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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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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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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No definition available.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Purchase price of common stock expressed as a percentage of its fair value.

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No definition available.

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Share-based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 29, 2004
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Options outstanding	1,137,179	1,412,602
Options exercisable	464,206
Income tax benefit related to expense	$ 4,300,000	$ 1,600,000	$ 1,300,000
Closing stock price	$ 36.18
Share-based compensation	$ 15,966,000	7,214,000	5,724,000
2012 LTIP Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award Contractual term	10 years
Amount of shares reserved for issuance	3,200,000
Options outstanding	787,646
Options exercisable	264,673
2004 LTIP Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Amount of shares reserved for issuance				3,100,000
Stock Purchase Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Amount of shares reserved for issuance	1,850,000
Maximum percentage of compensation eligible employees to be deducted for purchase of common stock	25.00%
Purchase price of shares equivalent to fair market value	85.00%
Shares issued under stock purchase plan	1,385,169
Stock Purchase Plan [Member] \| Minimum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Percentage of compensation eligible employees to be deducted for purchase of common stock	1.00%
Restricted Stock [Member] \| 2012 LTIP Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unvested restricted stock and stock units outstanding	551,229
Performance Stock Units [Member] \| 2012 LTIP Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unvested restricted stock and stock units outstanding	151,575
Staff Share Option Plan [Member] \| 2004 LTIP Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Options outstanding	199,533
Options exercisable	199,533
Unvested restricted stock and stock units outstanding	0
Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unamortized compensation expense	$ 3,200,000
Weighted-average period for unamortized compensation cost expected to be recognized	1 year 7 months 6 days
Total intrinsic value of options exercised	$ 4,300,000	700,000	2,100,000
Aggregate intrinsic value of options outstanding	3,300,000	8,000,000	2,400,000
Aggregate intrinsic value of options exercisable	2,200,000	4,300,000	1,000,000
Share-based compensation	$ 2,021,000	$ 1,437,000	1,391,000
Time-based Restricted Stock Awards [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unvested restricted stock and stock units outstanding	358,919	379,138
Unamortized compensation expense	$ 10,600,000
Weighted-average period for unamortized compensation cost expected to be recognized	2 years 4 months 24 days
Non-vested shares	186,515	203,618
Non-vested shares, vested in period	$ 5,500,000	$ 5,600,000	2,500,000
Aggregate intrinsic value of restricted stock outstanding	13,000,000	14,900,000	11,300,000
Share-based compensation	6,016,000	$ 4,606,000	3,400,000
Performance-based Restricted Stock Awards [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unamortized compensation expense	$ 900,000
Weighted-average period for unamortized compensation cost expected to be recognized	2 years
Non-vested shares	0	110,660
Aggregate intrinsic value of restricted stock outstanding	$ 7,000,000	$ 7,600,000	2,600,000
Share-based compensation	5,716,000	0	0
Market-based PSUs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unamortized compensation expense	$ 3,800,000
Weighted-average period for unamortized compensation cost expected to be recognized	2 years 6 months
Non-vested shares	96,245
Aggregate intrinsic value of restricted stock outstanding	$ 3,500,000	0	0
Share-based compensation	$ 948,000	$ 0	0
Common stock issued based on performance stock units	1
Percentage of performance to be achieved	100.00%
Market-based PSUs [Member] \| July 1, 2016 Grant Date [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Performance period	3 years
Market-based PSUs [Member] \| Minimum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Percentage of performance to be achieved	50.00%
Market-based PSUs [Member] \| Maximum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Percentage of performance to be achieved	200.00%
Performance-Based PSUs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unvested restricted stock and stock units outstanding	192,310	192,310
Unamortized compensation expense	$ 1,800,000
Weighted-average period for unamortized compensation cost expected to be recognized	2 years
Non-vested shares		55,330
Aggregate intrinsic value of restricted stock outstanding	$ 2,000,000	$ 2,200,000	0
Share-based compensation	$ 0	$ 0	$ 0