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Share-Based Compensation - Intrinsic Values and Remaining Contractual Terms of Company's Stock Options and Stock Appreciation Rights (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Intrinsic Value, Options outstanding $ 315,083
Intrinsic Value, Options exercisable   
Weighted Average Remaining Life in Years, Options outstanding 8 years 2 months 12 days
Weighted Average Remaining Life in Years, Options exercisable 7 years 9 months 18 days