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Stock-Based Compensation (Detail) - USD ($) |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Jun. 18, 2018 | Dec. 31, 2017 | Jul. 20, 2017 | Mar. 01, 2017 | Jul. 03, 2012 | Feb. 08, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 03, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  | $ 13,036,000 | $ 16,433,000 | $ 10,713,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  |  | $ 6,841,000 | $ 9,936,000 | $ 16,983,000 |
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period |  |  |  |  |  |  |  | 773,351,000 | 614,283,000 | 483,033,000 |
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share) |  |  |  |  |  |  |  | $ 26.38 | $ 22.68 | $ 21.58 |
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number | 1,651,337,000 |  |  |  |  |  |  | 1,651,337,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | $ 7,863,000 |  |  |  |  |  |  | $ 7,863,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  | 2 years 7 months 21 days |  |  |
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized | $ 60,517,000 |  |  |  |  |  |  | $ 60,517,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value |  |  |  |  |  |  |  | $ 36,122,000 | $ 21,549 | $ 9,758 |
Related Party Transaction Restricted Shares Granted During The Period |  |  |  |  |  | 2,840,013 | 2,194,586 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 7 years |  |  |  |  | 6 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  | 1,125,000 |  |  | 4,946,738 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 225,000 |  | 225,000 |  |  |  | 585,000 | 1,593,000 | 393,000 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share Price |  | $ 35.95 |  | $ 26.77 | $ 24.90 | $ 14.09 | $ 18.23 |  |  |  | $ 23.83
Executive D [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 6 years |  | 7 years |  | 5 years |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  | 4 years 6 months |  |  |

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- Definition As of the balance sheet date, the aggregate unrecognized cost of restricted stock awards made to employees under equity-based compensation awards that have yet to vest. + References No definition available. + Details
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- Definition Gross number of share units granted during the period to an officer of the company. + References No definition available. + Details
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- Definition The number of non-vested equity-based payment instruments, including stock (or unit) options, that validly exist and are outstanding as of the balance sheet date + References No definition available. + Details
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- Definition The weighted-average price as of balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan that vested during the reporting period. + References No definition available. + Details
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- Definition Number of options for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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=96867065&loc=d3e5070-113901 + Details
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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. + References No definition available. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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