Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended			6 Months Ended
	Sep. 06, 2014	Sep. 06, 2014	Sep. 06, 2014 8.00% Senior Notes due May 2016 [Member]	Feb. 22, 2014 8.00% Senior Notes due May 2016 [Member]	Sep. 06, 2014 Minimum [Member]	Sep. 06, 2014 Minimum [Member] 2015 [Member]	Sep. 06, 2014 Maximum [Member]	Sep. 06, 2014 Maximum [Member] 2015 [Member]
Subsequent Event [Line Items]
Excess pension contributions required	$ 47	$ 47			$ 120	$ 120	$ 125	$ 125
Debt instrument, interest rate			8.00%	8.00%