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Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stockholders Equity Note [Line Items] |  |  |
Preferred stock, shares issued | 0 |  |
Preferred stock, shares outstanding | 0 |  |
Incremental stock-based compensation expense arising from the modification | $ 521 |  |
Restricted Stock |  |  |
Stockholders Equity Note [Line Items] |  |  |
Number of restricted shares granted | 1,555,361 | 315,899 | 328,734
Market value of common stock on the dates of grant | $ 17.68 | $ 37.34 | $ 38.72
Restricted stock grants vested | 832,609 | 209,821 | 250,442
Unrecognized compensation expense | $ 20,183 |  |
Remaining Compensation Expense recognition period (in years) | 2 years |  |
Restricted Stock | ASC Topic 718 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Restricted stock grants vested | 191,983 |  |
Restricted Stock | Directors |  |  |
Stockholders Equity Note [Line Items] |  |  |
Award vesting period for restricted stock | 1 year |  |
Restricted Stock | Employees |  |  |
Stockholders Equity Note [Line Items] |  |  |
Restricted stock grants vested | 300,891 |  |
Restricted Stock | Minimum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the dates of grant | $ 8.39 |  |
Forfeiture rate for restricted stock awards | 0.00% |  |
Restricted Stock | Minimum | Employees |  |  |
Stockholders Equity Note [Line Items] |  |  |
Award vesting period for restricted stock | 1 year |  |
Restricted Stock | Maximum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the dates of grant | $ 32.12 |  |
Forfeiture rate for restricted stock awards | 10.00% |  |
Restricted Stock | Maximum | Employees |  |  |
Stockholders Equity Note [Line Items] |  |  |
Award vesting period for restricted stock | 4 years |  |
Restricted Stock Units (RSUs) |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the dates of grant | $ 32.12 | $ 36.77 |
Restricted stock grants vested | 208,204 | 90,895 | 127,084
Unrecognized compensation expense |  |  | $ 11,849
Remaining Compensation Expense recognition period (in years) | 2 years |  |
Number of hypothetical shares of common stock | 436,681 | 306,651 | 228,194
Share-based compensation arrangement by share-based payment award, description | The financial performance factors are based on an implied equity value concept that determines an internal rate of return (“IRR”) for a two year measurement period, as defined in the award agreement, based on a formula utilizing a multiple of Adjusted EBITDA subject to certain specified adjustments (as defined in the restricted stock unit award agreement). |  |
Share-based compensation arrangement by share-based payment award, vesting condition | All payouts of restricted stock units that vest will be subject to an additional service requirement and will be paid in the form of common stock if the participant continues to provide services through the fourth anniversary of the grant date. |  |
Internal rate of return, performance period | 2 years |  |
Percentage of IRR expected | 9.00% |  |
Percentage of IRR, which is the threshold, before modification |  | 7.00% |
Percentage of IRR, which is the target before modification |  | 9.50% |
Percentage of IRR, which is the maximum before modification |  | 13.00% |
Percentage of IRR, which is the threshold | 6.00% | 6.00% | 6.00%
Percentage of IRR, which is the target | 8.00% | 8.00% | 8.00%
Percentage of IRR, which is the maximum | 14.00% | 14.00% | 14.00%
Number of hypothetical shares of common stock at maximum IRR level | 890,680 |  |
Restricted Stock Units (RSUs) | Stock Grants 2016 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Impact of modification of awards |  | $ 132 |
Achieved Percentage of IRR | 9.30% |  |
Impact of final performance measure |  | $ 563 |
Restricted Stock Units (RSUs) | Stock Grant 2017 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Achieved Percentage of IRR |  | 9.30% |
Restricted Stock Units (RSUs) | Stock Grant 2018 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Achieved Percentage of IRR | 8.00% |  |
Restricted Stock Units (RSUs) | ASC Topic 718 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Restricted stock grants vested | 87,911 |  |
Weighted average grant date fair value per share as of date of modification | $ 15.95 |  |
Incremental stock-based compensation expense arising from the modification | $ 521 |  |
Restricted Stock Units (RSUs) | Minimum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the dates of grant |  |  | $ 37.55
Expected forfeiture rate | 0.00% | 0.00% | 0.00%
Restricted Stock Units (RSUs) | Maximum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the dates of grant |  |  | $ 39.03
Expected forfeiture rate | 5.00% | 5.00% | 5.00%

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