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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of common shares used for basic earnings per share	45,190,089	45,091,983	45,173,239	45,067,539
Effect of potential dilutive shares:
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share	46,702,772	45,091,983	46,835,487	45,067,539
Warrants [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	1,480,990	0	1,625,901	0
Employee Stock Option [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	8,409	0	10,625	0
Anti-dilutive shares excluded from reconciliation			110,000
Restricted Stock Units (RSUs) [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	18,242	0	21,628	0
Performance Shares [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	5,042	0	4,094	0