Debt - Summary of Debt (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt	$ 1,472,045	$ 1,421,681
Debt instrument, net	1,469,260
Revolving credit facility [Member]
Debt Instrument [Line Items]
Interest rate	Variable	Variable
Principal amount	155,000	105,000
2006 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Interest rate	Various	Various
Principal amount	125,000	125,000
2011 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured senior notes, interest rate	6.875%	6.875%
Principal amount	450,000	450,000
2012 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured senior notes, interest rate	6.375%	6.375%
Principal amount	350,000	350,000
Unamortized premium	2,785	2,873
Debt instrument, net	352,785	352,873
2013 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured senior notes, interest rate	5.75%	5.75%
Debt	275,380	274,860
Term loans [Member]
Debt Instrument [Line Items]
Interest rate	Various	Various
Debt	$ 113,880	$ 113,948