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Equity - Summary of Stock Option Plan (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Compensation Related Costs [Abstract]    
Shares Outstanding, Beginning balance 1,250,829  
Shares, Granted 89,675  
Shares, Exercised 0  
Shares, Cancelled (21,500)  
Shares Outstanding, Ending balance 1,319,004 1,250,829
Shares, Options exercisable 7,963  
Weighted Average Exercise Price Per Share, Outstanding, Beginning balance $ 22.45  
Weighted Average Exercise Price Per Share, Granted $ 21.07  
Weighted Average Exercise Price Per Share, Cancelled $ 22.00  
Weighted Average Exercise Price Per Share, Outstanding, Ending balance $ 22.36 $ 22.45
Weighted Average Exercise Price Per Share, Options exercisable $ 20.93  
Weighted Average Remaining Contractual Life (In Years), Outstanding 8 years 7 months 6 days 9 years 3 months 18 days
Weighted Average Remaining Contractual Life (In Years), Options exercisable 8 years 8 months 12 days  
Aggregate Intrinsic Value, Outstanding, Beginning balance $ 520  
Aggregate Intrinsic Value, Outstanding, Ending balance   520
Aggregate Intrinsic Value, Outstanding, Options exercisable