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Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Level 3 [Member]
Dec. 31, 2011
Level 3 [Member]
Sep. 30, 2012
Level 3 [Member]
Auction Rate Securities [Member]
Sep. 30, 2012
Minimum [Member]
Level 3 [Member]
Auction Rate Securities [Member]
Sep. 30, 2012
Maximum [Member]
Level 3 [Member]
Auction Rate Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]              
Principal         $ 120,306 [1]    
Valuation Adjustment         5,256 [1]    
Fair Value $ 11,847 [2] $ 46,958 [2] $ 12,805 [2] $ 12,482 [2] $ 115,050 [1]    
Valuation Technique         Discounted Cash Flow [1]    
Discount Rate           1.14% 3.01%
Duration           5 years 8 years
Current Yield           0.27% [3] 1.37% [3]
[1] Includes ARS owned by the Company of $79.8 million included in the condensed consolidated balance sheet at September 30, 2012 as well as additional commitments to purchase ARS from clients of $40.5 million which is disclosed in the notes to the co
[2] Included in other assets on the condensed consolidated balance sheet.
[3] Based on current auctions in comparable securities that have not failed