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Equity-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense	$ 5,200	$ 3,200			$ 18,620	$ 19,265
Recognized equity-based compensation expense					5,500
Unrecognized equity compensation cost	$ 25,500				$ 25,500
Omnibus Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance, gross	15,000,000				15,000,000
Shares available for future issuance	9,360,000				9,360,000
2018 Bonus Plan [Member] \| Scenario, Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of bonus payable by cash							50.00%
2018 Long-Term Incentive Plan Below Threshold Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year					0.00%
2018 Long-Term Incentive Plan At or Above Maximum Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year					200.00%
2.75x Performance Restricted Shares [Member] \| Upon Closing of Sale [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized equity-based compensation expense			$ 8,400
Percentage of restricted shares to vest				60.00%
Accumulated dividends paid related to performance shares which vested during the period			$ 1,300
2.75x Performance Restricted Shares [Member] \| Upon Closing of Sale [Member] \| Modification of Vesting Conditions [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized equity-based compensation expense						$ 8,400
Bonus Performance Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares vested					69,000
Bonus Performance Restricted Units [Member] \| 2018 Bonus Plan [Member] \| Scenario, Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of bonus payable by units							50.00%
Below Threshold Performance Bonus Restricted Units [Member] \| 2018 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year					0.00%
At or Above Maximum Performance Bonus Restricted Units [Member] \| 2018 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year					150.00%
Long-Term Incentive Time Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year					33.00%
Long-Term Incentive Time Restricted Units [Member] \| 2018 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period					5 years
Long-Term Incentive Time Restricted Units [Member] \| Third Anniversary [Member] \| 2018 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year					33.00%
Long-Term Incentive Time Restricted Units [Member] \| Fourth Anniversary [Member] \| 2018 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year					33.00%
Long-Term Incentive Time Restricted Units [Member] \| Fifth Anniversary [Member] \| 2018 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year					33.00%
Long-Term Incentive Time Restricted Units [Member] \| Employees [Member] \| Third Anniversary [Member] \| 2018 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year					100.00%
Vesting period					3 years
Long-Term Incentive Performance Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year					67.00%
Long-Term Incentive Performance Restricted Units [Member] \| 2018 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period					3 years
Description of additional incentive for early achievement of adjusted EBITDA target					If the Company's Fiscal 2020 Adjusted EBITDA target is achieved in 2018, 30% of target Long-Term Incentive Performance Restricted Units will be earned and delivered in 2019; if the Company's Fiscal 2020 Adjusted EBITDA target is achieved in 2019, 20% of target Long-Term Incentive Performance Restricted Units will be earned and delivered in 2020, in each case subject to the overall maximum award of 200% of target.
Performance-vesting Restricted Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense	$ 2,800				$ 8,000
Unrecognized equity compensation cost	$ 10,000				$ 10,000
Deferred Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period					1 year
Shares granted to members of Board of Directors					46,000
Number of common stock issuable for each unit	1				1