Quarterly report pursuant to Section 13 or 15(d)

Dispositions - Additional Information (Detail)

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Dispositions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 6 Months Ended
Apr. 30, 2012
Jun. 30, 2012
Business Acquisition [Line Items]    
Percentage of ownership interest sold 80.00%  
Gain on sale of business $ 42,000 $ 41,745