Net Income Per Share - Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share (Detail) - Successor [Member] - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of common shares used for basic earnings per share	45,212,484	45,190,089	45,194,731	45,173,239
Effect of potential dilutive shares:
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share	45,375,088	46,702,772	45,309,543	46,835,487
Restricted Stock Units (RSUs) [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	104,457	18,242	80,680	21,628
Performance Shares [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	58,147	5,042	34,132	4,094
Warrants [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	0	1,480,990	0	1,625,901
Employee Stock Option [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	0	8,409	0	10,625