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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 11, 2019 | Mar. 11, 2019 | Feb. 28, 2019 | Jul. 23, 2018 | May 07, 2018 | Apr. 30, 2018 | Feb. 22, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized stock based compensation related to all stock-based awards |  |  |  |  |  |  |  | $ 29.6 |
Weighted average period, expense to recognize |  |  |  |  |  |  |  | 2 years 3 months |
Chief Executive Officer | Performance metric based on Company's TSR |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Allocation of RSU's to performance metrics (percent) |  |  | 30.00% |  |  |  |  |  |
Chief Executive Officer | Performance metric based on Company's earnings per share |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Allocation of RSU's to performance metrics (percent) |  |  | 70.00% |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) |  |  |  |  |  |  |  | 1,593,747 |
Fair value of RSUs (in dollars per share) |  |  |  |  |  |  |  | $ 12.45 | $ 11.05
RSUs that vested in period (shares) |  |  |  |  |  |  |  | 795,528 |
Restricted Stock Units (RSUs) | Performance-based RSUs | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting rights (percent) |  |  | 0.00% |  |  |  | 0.00% |  |
Restricted Stock Units (RSUs) | Performance-based RSUs | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting rights (percent) |  |  | 100.00% |  |  |  | 100.00% |  |
Restricted Stock Units (RSUs) | Employees and Officers | Time-vested RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) | 3,025 |  | 990,723 |  | 4,258 |  | 633,107 |  |
Restricted stock units, vesting period |  | 3 years |  |  |  |  | 3 years |  |
Closing stock price on date of grant (in dollars per share) | $ 13.22 | $ 13.22 | $ 12.60 |  | $ 17.61 |  | $ 16.94 |  |
Restricted Stock Units (RSUs) | Chief Executive Officer |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) |  |  | 247,619 |  |  |  | 184,179 |  |
Restricted Stock Units (RSUs) | President |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) |  |  | 238,095 |  |  |  | 177,095 |  |
Restricted Stock Units (RSUs) | Chief Financial Officer |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) |  |  | 114,285 |  |  |  | 85,005 |  |
Restricted Stock Units (RSUs) | Non-employee Members on Board of Directors | Time-vested RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) |  |  |  | 6,677 |  | 40,910 |  |  |
Closing stock price on date of grant (in dollars per share) |  |  |  | $ 16.37 |  | $ 17.11 |  |  |
Restricted Stock Units (RSUs) | Employees Officers And Directors | Performance-based RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Closing stock price on date of grant (in dollars per share) |  |  | $ 12.60 |  |  |  | $ 16.94 |  |
Fair value of RSUs (in dollars per share) |  |  | $ 8.16 |  |  |  | $ 10.97 |  |
2013 Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock (shares) |  |  |  |  |  |  |  | 11,727,833 |
Shares available for future grant (shares) |  |  |  |  |  |  |  | 5,886,605 |

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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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