Activity of Awarded Options (Detail) - USD ($)	8 Months Ended	12 Months Ended
	Sep. 12, 2016	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Cancelled	$ (3,083,821)
Share-based Compensation Arrangement by Share-by Payment Awards, Options, Weighted Average Price of Shares Canceled	$ 16.05
Shares Under Options
Outstanding at beginning of year (in shares)	3,083,821	3,083,821
Granted (in shares)		0
Exercised (in shares)		0
Forfeited (in shares)		0
Outstanding at end of year (in shares)		0	3,083,821
Exercisable at end of year (in shares)		0
Weighted- Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 16.05	$ 16.05
Granted (in dollars per share)		0.00
Exercised (in dollars per share)		0.00
Forfeited (in dollars per share)		0.00
Outstanding at end of year (in dollars per share)		0.00	$ 16.05
Exercisable at end of year (in dollars per share)		$ 0.00
Aggregate Intrinsic Value
Balance as of December 31, 2016 (Successor)		$ 0
Exercisable as of end of year (Successor)		$ 0
Non-employee Director | Common Stock [Member]
Shares Under Options
Exercised (in shares)		0	0