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Indebtedness - Senior Unsecured Notes Repurchases (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Unsecured Senior Notes [Line Items]    
Principal Amount Repurchased $ 106,303 $ 112,757
Purchase Price 110,613 110,667
2014 Notes [Member]
    
Unsecured Senior Notes [Line Items]    
Principal Amount Repurchased 9,000 1,144
Purchase Price 9,439 1,143
2016 Notes [Member]
    
Unsecured Senior Notes [Line Items]    
Principal Amount Repurchased   500
Purchase Price   475
2017 Notes [Member]
    
Unsecured Senior Notes [Line Items]    
Principal Amount Repurchased 4,223 27,619
Purchase Price 4,632 27,506
2017 II Notes [Member]
    
Unsecured Senior Notes [Line Items]    
Principal Amount Repurchased   10,969
Purchase Price   10,182
2027 Notes [Member]
    
Unsecured Senior Notes [Line Items]    
Principal Amount Repurchased   7,500
Purchase Price   7,500
2028 Notes [Member]
    
Unsecured Senior Notes [Line Items]    
Principal Amount Repurchased 69,680 65,025
Purchase Price 72,541 63,861
2032 Notes [Member]
    
Unsecured Senior Notes [Line Items]    
Principal Amount Repurchased 23,400  
Purchase Price $ 24,001