Annual report pursuant to Section 13 and 15(d)

Long Term Debt (Parenthetical) (Detail)

v2.4.0.6
Long Term Debt (Parenthetical) (Detail) (8.625% senior notes due 2019, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
8.625% senior notes due 2019
   
Debt Instrument [Line Items]    
Aggregate principal amount issued $ 470,000 $ 470,000
Discount on issue $ 8,536 $ 9,470