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Stock-Based Compensation Plans and Employee Benefits - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class Of Stock [Line Items] |  |  |
Share-based payments award, number of shares available for grant | 5.8 |  |
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 | $ 0.8 |  |
Term of recognition of unrecognized stock option compensation cost | 1 year 7 months 6 days |  |
RSUs [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Restricted common shares | 0.5 |  |
Restricted Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Vesting period | 4 years |  |
Total unrecognized compensation cost granted | $ 10.9 |  |
Term of recognition of unrecognized stock option compensation cost | 2 years 6 months |  |
Restricted common shares |  | 0.2 | 0.3
Weighted-average fair value of the restricted stock | $ 16.31 |  |
Common shares issued | 0.1 | 0.1 | 0.1
Restricted Stock [Member] | Minimum [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Weighted-average fair value of the restricted stock | $ 12.17 |  |
Restricted Stock [Member] | Maximum [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Weighted-average fair value of the restricted stock | $ 19.26 |  |
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% |  |

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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=6415400&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=6415400&loc=d3e5047-113901 + Details
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