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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class Of Stock [Line Items] |  |  |
Share-based payments award, number of shares available for grant | 5,500,000 |  |
Number of Options, Granted | 154,000 | 633,000 | 557,000
2016 VSEP [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Vesting period | 7 years |  |
Compensation fully earned and vested description | Awards under the 2016 VSEP, if earned, may result in the granting of common shares of the Company and time-vested RSUs to participants on future measurement dates based on a performance period beginning on February 9, 2016 and ending on December 31, 2018 (the “Performance Period”). As a result, in general, the total compensation available to participants under the 2016 VSEP, if any, will be fully earned only after approximately seven years (the Performance Period and the final four-year, time-based vesting period for RSUs). |  |
Settlement percentage of common shares | 20.00% |  |
Settlement percentage of restricted stock units | 80.00% |  |
Expected lapse percentage | 20.00% |  |
Minimum [Member] | 2016 VSEP [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Share price for vesting |  | $ 17.41 |
Maximum [Member] | 2016 VSEP [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Share price for vesting | $ 25.35 |  |
Stock options [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Contractual term of stock options, Maximum | 10 years |  |
Vesting period | 3 years |  |
Portion of increments granted for stock options | one-third |  |
Term of increment grant | one year after the date of grant. |  |
Total unrecognized compensation cost granted | $ 0.3 |  |
Term of recognition of unrecognized stock option compensation cost | 1 year 4 months 24 days |  |
RSUs [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Restricted common shares | 700,000 | 500,000 |
Restricted Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Total unrecognized compensation cost granted | $ 11.3 |  |
Term of recognition of unrecognized stock option compensation cost | 2 years 1 month 6 days |  |
Restricted common shares |  |  | 200,000
Weighted-average fair value of the restricted stock | $ 13.86 |  |
Common shares issued | 100,000 | 100,000 | 100,000
Restricted Stock [Member] | Minimum [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Vesting period | 3 years |  |
Weighted-average fair value of the restricted stock | $ 8.78 |  |
Restricted Stock [Member] | Maximum [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Vesting period | 4 years |  |
Weighted-average fair value of the restricted stock | $ 19.26 |  |
Performance-Based Restricted Share Units (PRSUs) [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Performance-based restricted share units, description | In 2017, the Board of Directors approved grants to the chief executive officer, chief operating officer and chief financial officer, PRSUs covering a “target” number of shares, subject to a performance period beginning on March 1, 2017, for one-year, two-year and three-year periods. |  |
Performance-based restricted share units, fair value | $ 3.9 |  |
Share-based compensation arrangement by share-based payment award, award amortized period | Feb. 28, 2020 |  |
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% |  |
Time-based Vesting [Member] | 2016 VSEP [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Vesting period | 4 years |  |
Performance Awards [Member] | 2016 VSEP [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Aggregate percentage of performance awards | 1.4909% |  |
Number of Options, Granted | 0 |  |

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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition 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). + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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