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Summary of Transaction Stock Options Issued Pursuant to ORCC Incentive Plan (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
Number of Shares  
Outstanding, Beginning Balance 7,408,821
Granted 27,132
Exercised (1,371,369)
Forfeited or expired (95,886)
Outstanding, Ending Balance 5,968,698
Number of Shares Exercisable, Ending Balance 4,208,882
Weighted-Average Exercise Price  
Beginning Balance $ 11.02
Granted $ 20.13
Exercised $ 8.09
Forfeited or expired $ 17.30
Ending Balance $ 11.64
Weighted Average Exercise Price Exercisable, Ending Balance $ 9.39
Weighted-Average Remaining Contractual Term (Years)  
Weighted Average Remaining Contractual Term (Years), Outstanding as of end of period 5 years 5 months 19 days
Weighted Average Remaining Contractual Term (Years), Exercisable as of end of period 4 years 1 month 28 days
Aggregate Intrinsic Value of In-the-Money Options  
Aggregate Intrinsic Value of In-the-Money Options, Outstanding as of end of period $ 44,151,829
Aggregate Intrinsic Value of In-the-Money Options, Exercisable as of end of period $ 39,428,761