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Stock-Based Compensation Plans and Employee Benefits - Additional Information (Detail) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2018 | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares
Class Of Stock [Line Items] |  |  |  |
Reverse stock split |  | one-for-two |  |
Reverse stock split conversion ratio | 0.5 |  |  |
Share-based payments award, number of shares available for grant |  | 1,700,000 |  |
Number of awards, granted |  | 0 | 77,000 | 316,000
Black-Scholes Option Pricing Model [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, shares granted |  | 0 |  |
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 | $ |  | $ 0.1 |  |
Term of recognition of unrecognized stock option compensation cost |  | 10 months 24 days |  |
RSUs [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Restricted common shares |  | 300,000 | 400,000 | 300,000
Restricted Stock [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, shares granted |  | 344,000 |  |
Total unrecognized compensation cost granted | $ |  | $ 12.7 |  |
Term of recognition of unrecognized stock option compensation cost |  | 1 year 7 months 6 days |  |
Weighted-average fair value of the restricted stock | $ / shares |  | $ 13.01 |  |
Common shares issued |  | 100,000 |  |
Restricted Stock [Member] | Minimum [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Weighted-average fair value of the restricted stock | $ / shares |  | $ 12.26 |  |
Restricted Stock [Member] | Maximum [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Vesting period |  | 4 years |  |
Weighted-average fair value of the restricted stock | $ / shares |  | $ 38.52 |  |
Performance-Based Restricted Share Units (PRSUs) [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, shares granted |  | 0 |  |
Performance-based restricted share units, description |  | In 2018, the Board of Directors approved grants to the chief executive officer, chief operating officer and chief financial officer of PRSUs covering a “target” number of shares, subject to a performance period beginning on March 1, 2018, and ending on February 28, 2021. In 2017, the Board of Directors approved grants to the chief executive officer, chief operating officer and chief financial officer of PRSUs covering a “target” number of shares, subject to a one-year, two-year and three-year performance periods beginning on March 1, 2017. |  |
Performance-based restricted share units, fair value | $ |  | $ 4.7 | $ 3.9 |
Share-based compensation arrangement by share-based payment award, award amortized period |  | Feb. 28, 2021 | 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% |  |
Performance Awards [Member] | 2016 VSEP [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Number of awards, granted |  | 0 |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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=109197908&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://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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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