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Equity-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense			$ 22,152	$ 23,203	$ 37,515
Recognized equity-based compensation expense	$ 8,400		5,500
Unrecognized equity compensation cost			$ 18,200
Unrecognized equity compensation cost, weighted-average period			1 year 8 months 12 days
Total fair value of shares vested during the period			$ 12,100	13,800	32,200
Total intrinsic value of stock options exercised			$ 1,700
Accumulated dividends paid related to performance shares which vested during the period				1,270	3,400
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
Shares available for future issuance			9,770,000
2018 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of bonus payable in 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]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized equity-based compensation expense				8,400
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]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of restricted shares to vest		60.00%
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
2.25x Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized equity-based compensation expense					27,500
Accumulated dividends paid related to performance shares which vested during the period					$ 3,400
Time Vesting and Performance Vesting Restricted Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value			$ 15.40	$ 17.71	$ 17.20
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]
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 period			3 years
Vesting percentage			33.00%
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 target was achieved in 2018, 30% of target Long-Term Incentive Performance Restricted Units would have been earned and delivered in 2019; if the Company’s Fiscal 2020 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.
Long-Term Incentive Time Restricted Shares [Member] \| Executives [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			5 years
Long-Term Incentive Time Restricted Shares [Member] \| Third Anniversary [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			3 years
Vesting percentage			100.00%
Long-Term Incentive Time Restricted Shares [Member] \| Third Anniversary [Member] \| Executives [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage			33.00%
Long-Term Incentive Time Restricted Shares [Member] \| Fourth Anniversary [Member] \| Executives [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage			33.00%
Long-Term Incentive Time Restricted Shares [Member] \| Fifth Anniversary [Member] \| Executives [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage			33.00%
Other Long-Term Incentive Time Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting description			Other Long-Term Incentive Time Restricted Shares vest ratably over four years or three years from the date of grant, subject to continued employment through the applicable vesting date. Equity compensation expense is recognized using the straight line method over the respective vesting period.
Long-Term Incentive Performance Restricted Shares [Member] \| 2017 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period			3 years
Granted Shares/Units			210,000
Long-Term Incentive Performance Restricted Shares [Member] \| 2016 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period			3 years
Granted Shares/Units			100,500
Long-Term Incentive Performance Restricted Shares [Member] \| 2016 Long-Term Incentive Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding shares			99,200
Performance-vesting Restricted Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense			$ 10,300
Unrecognized equity compensation cost			$ 8,600
Long-Term Incentive Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			4 years
Vesting percentage			25.00%
Long-Term Incentive Options, expiration period			10 years
Deferred Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			1 year
Granted Shares/Units			46,000
Number of common stock shares to be received for each deferred stock unit			1
Period of time after director has left the board to receive shares			1 year