Treasury Stock and Share Based Awards - Additional Information (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares
Restricted Stock
Stockholders Equity Note [Line Items]
Number of restricted shares granted | shares	1,045,885
Market value of common stock on the dates of grant	$ 18.35
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%
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%
Award vesting period for restricted stock	4 years
Unvested Restricted Stock Awards
Stockholders Equity Note [Line Items]
Unrecognized compensation expense | $	$ 22,858
Remaining compensation expense recognition period (in years)	2 years
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]
Market value of common stock on the dates of grant	$ 32.12
Unrecognized compensation expense | $	$ 13,559
Remaining compensation expense recognition period (in years)	2 years
Number of hypothetical shares of common stock | shares	436,681
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, 2021 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 2020 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 IRR levels | shares	978,591
Restricted Stock Units (RSUs) | Stock Grants 2018
Stockholders Equity Note [Line Items]
Achieved percentage of IRR	8.60%
Restricted Stock Units (RSUs) | Stock Grants 2017
Stockholders Equity Note [Line Items]
Achieved percentage of IRR	9.30%
Restricted Stock Units (RSUs) | ASC Topic 718
Stockholders Equity Note [Line Items]
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) | Maximum | Threshold IRR
Stockholders Equity Note [Line Items]
Vesting percentage of restricted stock units	33.33%
Restricted Stock Units (RSUs) | Maximum | Targeted IRR
Stockholders Equity Note [Line Items]
Vesting percentage of restricted stock units	66.66%
Restricted Stock Units (RSUs) | Maximum | Maximum IRR
Stockholders Equity Note [Line Items]
Vesting percentage of restricted stock units	100.00%