Debt - 2011 Senior Unsecured Notes - Additional Information (Detail) (2011 Senior Unsecured Notes [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
	Apr. 26, 2011	Dec. 31, 2013	Dec. 31, 2012
2011 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 450,000	$ 450,000	$ 450,000
Interest rate	6.875%	6.875%	6.875%
Debt instrument, maturity date	May 01, 2021
Senior notes frequency of periodic payment	Semi-annually
Senior notes, earliest redemption date	May 01, 2016
Senior notes, repurchase price percentage on principal amount plus accrued and unpaid interest	101.00%