Fair Value Measurements - Additional Information (Detail)	Dec. 31, 2012	Dec. 31, 2011
First Lien Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading prices rate to calculate the fair value	100.75%	98.50%
Second Lien Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading prices rate to calculate the fair value	102.75%	97.50%
7.75% Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading prices rate to calculate the fair value	98.30%	88.80%