Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Detail)

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Fair Value Measurements (Detail) (USD $)
3 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Jun. 30, 2012
Territory Ahead [Member]
Jun. 30, 2012
Level 1 [Member]
Dec. 31, 2011
Level 1 [Member]
Jun. 30, 2011
Level 1 [Member]
Jun. 30, 2011
Level 3 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]                
Senior Notes, Carrying Value $ 240,000,000 $ 240,000,000 $ 240,000,000          
Senior Notes, Fair Value 255,000,000 264,000,000 270,000,000   255,000,000 264,000,000 270,000,000  
Term Loan, Carrying Value 250,000,000   69,841,000          
Term Loan, Fair Value     69,566,000         69,566,000
Impairment charge       5,300,000        
Impairment charge, net of tax       $ 3,300,000