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Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders Equity Note [Line Items] |  |  |
Preferred stock, shares issued | 0 |  |
Preferred stock, shares outstanding | 0 |  |
Restricted Stock |  |  |
Stockholders Equity Note [Line Items] |  |  |
Number of hypothetical shares of common stock | 328,734 |  |
Market value of common stock on the dates of grant | $ 38.72 | $ 41.70 | $ 30.98
Unrecognized compensation expense | $ 15,174 |  |
Remaining Compensation Expense recognition period (in years) | 2 years |  |
Restricted Stock | Directors |  |  |
Stockholders Equity Note [Line Items] |  |  |
Award vesting period for restricted stock granted | 1 year |  |
Restricted Stock | Minimum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the dates of grant | $ 35.80 |  |
Forfeiture rate for restricted stock awards | 0.00% |  |
Restricted Stock | Minimum | Employees |  |  |
Stockholders Equity Note [Line Items] |  |  |
Award vesting period for restricted stock granted | 1 year |  |
Restricted Stock | Maximum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the dates of grant | $ 39.26 |  |
Forfeiture rate for restricted stock awards | 10.00% |  |
Restricted Stock | Maximum | Employees |  |  |
Stockholders Equity Note [Line Items] |  |  |
Award vesting period for restricted stock granted | 4 years |  |
Restricted Stock Units (RSUs) |  |  |
Stockholders Equity Note [Line Items] |  |  |
Number of hypothetical shares of common stock | 228,194 | 175,634 | 253,661
Market value of common stock on the dates of grant |  | $ 42.37 | $ 29.83
Unrecognized compensation expense | $ 8,416 |  |
Remaining Compensation Expense recognition period (in years) | 2 years |  |
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% |  |
Expected forfeiture rate | 5.00% |  |
Number of hypothetical shares of common stock at maximum IRR level | 594,266 |  |
Actual cumulative forfeitures (in units) | 18,667 |  |
Restricted Stock Units (RSUs) | Stock Grants 2015 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Stock price at the date of modification |  |  | $ 37.98
Incremental compensation expense |  |  | $ 562
Restricted Stock Units (RSUs) | Stock Grant 2016 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Actual IRR calculated for grant | 7.20% |  |
Restricted Stock Units (RSUs) | Stock Grant 2017 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Actual IRR calculated for grant | 11.20% |  |
Restricted Stock Units (RSUs) | Stock Grant 2018 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Actual IRR calculated for grant | 9.50% |  |
Restricted Stock Units (RSUs) | Minimum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the dates of grant | $ 39.03 |  |
Restricted Stock Units (RSUs) | Maximum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the dates of grant | $ 37.55 |  |

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