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Summary of Transactions Stock Options Issued Pursuant to Stock Incentive Plans (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Number of Shares  
Outstanding, Beginning Balance 2,968,582
Exercised (242,379)
Cancelled (19,722)
Outstanding, Ending Balance 2,790,757
Number of Shares Exercisable, Ending Balance 1,670,866
Weighted-Average Exercise Price  
Beginning Balance $ 27.15
Exercised $ 22.68
Cancelled $ 33.83
Ending Balance $ 28.00
Weighted Average Exercise Price Exercisable, Ending Balance $ 25.26
Weighted-Average Remaining Contractual Term (Years)  
Weighted Average Remaining Contractual Term (Years), Outstanding as of end of period 5 years 1 month 10 days
Weighted Average Remaining Contractual Term (Years), Exercisable as of end of period 4 years 5 months 1 day
Aggregate Intrinsic Value of In-the-Money Options  
Aggregate Intrinsic Value of In-the-Money Options, Outstanding as of end of period $ 51,594,113
Aggregate Intrinsic Value of In-the-Money Options, Exercisable as of end of period 35,448,044
ORCC
 
Number of Shares  
Outstanding, Beginning Balance   
Transaction stock options converted upon acquisition of ORCC 37,468
Exercised (2,069)
Cancelled (1,029)
Outstanding, Ending Balance 34,370
Number of Shares Exercisable, Ending Balance 34,370
Weighted-Average Exercise Price  
Beginning Balance   
Transaction stock options converted upon acquisition of ORCC $ 91.92
Exercised $ 41.76
Cancelled $ 52.03
Ending Balance $ 96.14
Weighted Average Exercise Price Exercisable, Ending Balance $ 96.14
Weighted-Average Remaining Contractual Term (Years)  
Weighted Average Remaining Contractual Term (Years), Outstanding as of end of period 1 year 8 months 12 days
Weighted Average Remaining Contractual Term (Years), Exercisable as of end of period 1 year 8 months 12 days
Aggregate Intrinsic Value of In-the-Money Options  
Aggregate Intrinsic Value of In-the-Money Options, Outstanding as of end of period 29,486
Aggregate Intrinsic Value of In-the-Money Options, Exercisable as of end of period $ 29,486