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Stock-Based Compensation Plans and Employee Benefits - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class Of Stock [Line Items] |  |  |
Share-based payments award, number of shares available for grant | 3,700,000 |  |
Black-Scholes Option Pricing Model [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, shares granted | 0 | 0 |
Stock options [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Contractual term of stock options, Maximum | 10 years |  |
RSUs [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Restricted common shares | 300,000 | 300,000 | 400,000
Restricted Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, shares granted | 260,000 |  |
Weighted-average fair value of the restricted stock | $ 13.59 |  |
Common shares issued | 100,000 | 100,000 |
Total unrecognized compensation cost granted | $ 12.0 |  |
Term of recognition of unrecognized stock option compensation cost | 1 year 6 months |  |
Restricted Stock [Member] | Minimum [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Vesting period | 3 years |  |
Weighted-average fair value of the restricted stock | $ 11.64 |  |
Restricted Stock [Member] | Maximum [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Vesting period | 4 years |  |
Weighted-average fair value of the restricted stock | $ 30.31 |  |
Performance-Based Restricted Share Units (PRSUs) [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, shares granted | 0 | 0 |
Performance-based restricted share units, description | In 2019 and 2018, the Board of Directors approved grants to the chief executive officer, chief operating officer and former chief financial officer of PRSUs covering a “target” number of shares, subject to performance periods beginning on March 1, 2019 and March 1, 2018, respectively, and ending on February 28, 2022 and February 28, 2021, respectively. In 2017, the Board of Directors approved grants to the chief executive officer, chief operating officer and former chief financial officer of PRSUs covering a “target” number of shares, subject to one-year, two-year and three-year performance periods beginning on March 1, 2017. |  |
Performance-based restricted share units, fair value equity and liability awards | $ 5.6 | $ 4.7 | $ 3.9
Share based compensation arrangement by share based payment award, mark to market adjustment | $ 1.9 |  |
Performance-Based Restricted Share Units (PRSUs) [Member] | Minimum [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, target | 0.00% |  |
Performance-Based Restricted Share Units (PRSUs) [Member] | Maximum [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, target threshold | 200.00% |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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