Components of Long-Term Debt (Parenthetical) (Detail)		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Revolving Credit Facility	Dec. 31, 2012 Term loan facility, at a rate of 2.75%	Dec. 31, 2013 3.875% Convertible Senior Subordinated Notes	Dec. 31, 2012 3.875% Convertible Senior Subordinated Notes	Dec. 31, 2013 6.875% Senior Subordinated Notes Due 2019	Dec. 31, 2012 6.875% Senior Subordinated Notes Due 2019	Jun. 13, 2011 6.875% Senior Subordinated Notes Due 2019
Line Of Credit Facility [Line Items]
Interest rate		1.92%	2.75%
Interest rate	3.875%			3.875%	3.875%	6.875%	6.875%	6.875%
Debt instrument maturity date						2019	2019	2019
Debt maturity date		Jul. 16, 2018