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Share-based Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 29, 2004
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Options outstanding | 1,086,822 | 1,137,179 |  |
Options exercisable | 608,320 |  |  |
Income tax benefit related to expense | $ 3,400,000 | $ 4,300,000 | $ 1,600,000 |
Closing stock price | $ 54.70 |  |  |
Share-based compensation | $ 12,557,000 | 15,966,000 | 7,214,000 |
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 | 881,322 |  |  |
Options exercisable | 402,820 |  |  |
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 | 1,504,445 |  |  |
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 | 381,204 |  |  |
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 | 241,864 |  |  |
Staff Share Option Plan [Member] | 2004 LTIP Plan [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Options outstanding | 55,500 |  |  |
Unvested restricted stock and stock units outstanding | 0 |  |  |
Stock Option [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Service period | 4 years |  |  |
Unamortized compensation expense | $ 2,900,000 |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized | 1 year 6 months |  |  |
Total intrinsic value of options exercised | $ 2,200,000 | 4,300,000 | 700,000 |
Aggregate intrinsic value of options outstanding | 18,700,000 | 3,300,000 | 8,000,000 |
Aggregate intrinsic value of options exercisable | 12,400,000 | 2,200,000 | 4,300,000 |
Share-based compensation | 2,388,000 | 2,021,000 | 1,437,000 |
Time-based Restricted Stock Awards and Stock Units [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Unamortized compensation expense | $ 11,000,000 |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized | 2 years 4 months 24 days |  |  |
Non-vested shares | 143,469 |  |  |
Vesting period | 4 years |  |  |
Non-vested shares, vested in period | $ 7,300,000 | 7,200,000 | 6,100,000 |
Aggregate intrinsic value of restricted stock outstanding | 17,800,000 | $ 13,000,000 | $ 14,900,000 |
Performance-based Restricted Stock Awards [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Unamortized compensation expense | $ 400,000 |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized | 1 year |  |  |
Non-vested shares | 0 | 0 | 110,660 |
Non-vested shares, vested in period | $ 4,900,000 | $ 0 | $ 0 |
Aggregate intrinsic value of restricted stock outstanding | 3,000,000 | 7,000,000 | 7,600,000 |
Share-based compensation | 462,000 | $ 5,716,000 | 0 |
Market-based PSUs [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Unamortized compensation expense | $ 5,900,000 |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized | 2 years |  |  |
Non-vested shares | 94,902 | 96,245 |  |
Aggregate intrinsic value of restricted stock outstanding | $ 10,200,000 | $ 3,500,000 | 0 |
Share-based compensation | $ 2,904,000 | $ 948,000 | $ 0 |
Common stock issued based on performance stock units | 1 |  |  |
Percentage of performance to be achieved | 100.00% |  |  |
Market-based PSUs [Member] | July 2017 Grant Date [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Performance period | 3 years |  |  |
Market-based PSUs [Member] | July 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 | 55,330 | 192,310 |  |
Unamortized compensation expense | $ 1,800,000 |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized | 1 year |  |  |
Non-vested shares |  |  | 55,330 |
Aggregate intrinsic value of restricted stock outstanding | $ 3,000,000 | $ 2,000,000 | $ 2,200,000 |
Share-based compensation | $ 0 | $ 0 | $ 0 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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