Long-term Borrowings - Components of Long-Term Borrowings (Parenthetical) (Detail)	0 Months Ended		12 Months Ended			0 Months Ended
	May 16, 2011	Apr. 09, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jul. 18, 2013
10.5% senior notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate		10.50%	10.50%	10.50%	10.50%
Due date	Apr. 15, 2018	Apr. 15, 2018	Apr. 15, 2018	Apr. 15, 2018	Apr. 15, 2018
6.625% senior notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate			6.625%	6.625%	6.625%	6.625%
Due date			Jul. 15, 2021	Jul. 15, 2021	Jul. 15, 2021	Jul. 15, 2021