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Fair Value Measurements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Jun. 30, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Intangible asset impairment charge $ 14,800 $ 14,830 $ 14,830
Percentage of control premium for valuing assets   15.00%  
Minimum [Member]
     
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Percentage of weighted average cost of capital rates after tax   10.00%  
Maximum [Member]
     
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Percentage of weighted average cost of capital rates after tax   20.00%