Income (loss) per Share - Computation of Basic and Diluted Loss Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		8 Months Ended	9 Months Ended
	Sep. 30, 2014 Successor [Member]	Sep. 30, 2013 Successor [Member]	Sep. 30, 2013 Successor [Member]	Sep. 30, 2014 Successor [Member]	Sep. 30, 2014 Restricted Shares [Member]	Sep. 30, 2013 Restricted Shares [Member]	Sep. 30, 2014 Operating Partnership Units [Member]	Sep. 30, 2013 Operating Partnership Units [Member]
Numerator:
Net income (loss) attributed to common shareholders	$ 0.1	$ (0.8)	$ (4.0)	$ (0.8)
Less: Restricted stock dividends, Basic	(0.2)	(0.2)	(0.5)	(0.7)
Less: Restricted stock dividends, Diluted	(0.2)	(0.2)	(0.5)	(0.6)
Net loss available to shareholders, Basic	(0.1)	(1.0)	(4.5)	(1.5)
Net loss available to shareholders, Diluted	$ (0.1)	$ (1.0)	$ (4.5)	$ (1.4)
Denominator:
Weighted average common outstanding - basic (in shares)	36.9	20.9	20.9	26.5
Time-based restricted stock (in shares)		0	0	0
Convertible securities (in shares)		0	0	0
Weighted average shares outstanding- diluted (in shares)	36.9	20.9	20.9	26.5
EPS:
Net loss per share- basic (in dollars per share)	$ 0.00	$ (0.05)	$ (0.22)	$ (0.06)
Effect of dilutive shares:
Income (loss) per share - diluted (in dollars per share)	$ 0.00	$ (0.05)	$ (0.22)	$ (0.06)
Anti-dilutive securities excluded from diluted earning per share					0.9	0.2	36.9	42.6