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Debt - Summary of Debt (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Revolving credit facilities [Member]
Dec. 31, 2012
Revolving credit facilities [Member]
Dec. 31, 2013
2006 Senior Unsecured Notes [Member]
Dec. 31, 2012
2006 Senior Unsecured Notes [Member]
Jul. 30, 2011
2006 Senior Unsecured Notes [Member]
Dec. 31, 2013
2011 Senior Unsecured Notes [Member]
Dec. 31, 2012
2011 Senior Unsecured Notes [Member]
Apr. 26, 2011
2011 Senior Unsecured Notes [Member]
Dec. 31, 2013
2012 Senior Unsecured Notes [Member]
Aug. 20, 2013
2012 Senior Unsecured Notes [Member]
Dec. 31, 2012
2012 Senior Unsecured Notes [Member]
Feb. 17, 2012
2012 Senior Unsecured Notes [Member]
Dec. 31, 2012
Exchangeable senior notes [Member]
Dec. 31, 2013
2013 Senior Unsecured Notes [Member]
Dec. 31, 2013
Term loans [Member]
Dec. 31, 2012
Term loans [Member]
Dec. 31, 2013
2013 Senior Unsecured Notes [Member]
Oct. 10, 2013
2013 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]                                        
Interest rate     Variable Variable Various Various                     Various Various    
Unsecured senior notes, interest rate             7.871% 6.875% 6.875% 6.875% 6.375% 6.375% 6.375% 6.375% 9.25% 5.75%   6.20% 5.75% 5.75%
Principal amount     $ 105,000 $ 125,000 $ 125,000 $ 125,000   $ 450,000 $ 450,000 $ 450,000 $ 350,000   $ 200,000   $ 11,000     $ 13,900    
Unamortized discount                     2,873       (37)          
Debt instrument, net                     352,873   200,000   10,963 274,860 113,948 114,197    
Debt $ 1,421,681 $ 1,025,160