Net Property, Plant and Equipment - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		1 Months Ended
	Sep. 30, 2014 Successor [Member]	Sep. 30, 2013 Successor [Member]	Sep. 30, 2014 Successor [Member]	Sep. 30, 2013 Successor [Member]	Jan. 31, 2013 Predecessor [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 44.0	$ 41.3	$ 131.5	$ 88.1	$ 7.2