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Treasury Stock and Share Based Awards - Additional Information (Detail) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($) $ / shares shares
Restricted Stock |
Stockholders Equity Note [Line Items] |
Number of restricted shares | 247,342
Market value of common stock on the dates of grant | $ / shares | $ 36.77
Forfeiture rate for restricted stock awards | 10.00%
Award vesting period for restricted stock | 4 years
Unvested Restricted Stock Awards |
Stockholders Equity Note [Line Items] |
Unrecognized compensation expense | $ | $ 20,815
Remaining Compensation Expense recognition period (in years) | 3 years
Restricted Stock Units (RSUs) |
Stockholders Equity Note [Line Items] |
Market value of common stock on the dates of grant | $ / shares | $ 36.77
Unrecognized compensation expense | $ | $ 13,621
Remaining Compensation Expense recognition period (in years) | 3 years
Number of hypothetical shares of common stock | 306,651
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”) during the two fiscal year periods ending December 31, 2020 based on a formula utilizing a multiple of Adjusted EBITDA subject to certain adjustments as specified by the Compensation Committee prior to the grant date
Internal rate of return, performance period | 2 years
Percentage of IRR, which is the threshold | 6.00%
Percentage of IRR, which is the target | 8.00%
Percentage of IRR, which is the maximum | 14.00%
Percentage of IRR expected | 11.00%
Share-based compensation arrangement by share-based payment award, vesting condition | All restricted stock units granted during 2019 will vest subject to an additional two-year 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
Expected forfeiture rate | 5.00%
Number of hypothetical shares of common stock at maximum IRR level | 554,529
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%
Restricted Stock Units (RSUs) | Stock Grants 2016 |
Stockholders Equity Note [Line Items] |
Achieved Percentage of IRR | 7.20%
Impact of modification of awards | $ | $ 132
Impact of final performance measure | $ | $ 563
Restricted Stock Units (RSUs) | Stock Grants 2017 |
Stockholders Equity Note [Line Items] |
Achieved Percentage of IRR | 9.30%
Restricted Stock Units (RSUs) | Maximum | Threshold IRR |
Stockholders Equity Note [Line Items] |
Vesting percentage of restricted stock units | 76,065
Restricted Stock Units (RSUs) | Maximum | Targeted IRR |
Stockholders Equity Note [Line Items] |
Vesting percentage of restricted stock units | 152,129
Restricted Stock Units (RSUs) | Maximum | Maximum IRR |
Stockholders Equity Note [Line Items] |
Vesting percentage of restricted stock units | 100.00%

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