Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Summary of Company's Current Debt Portfolio (Parenthetical) (Detail)

v2.4.0.6
Long-Term Debt - Summary of Company's Current Debt Portfolio (Parenthetical) (Detail) (9.125% Senior Notes, due April 2018 [Member])
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
9.125% Senior Notes, due April 2018 [Member]
   
Debt Instrument [Line Items]    
Debt instrument maturity date April 2018 April 2018
Debt instrument fixed interest rate 9.125% 9.125%