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Stock-based Payment Arrangements - Summary of Stock Option Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding, Number of Option, Beginning Balance 850,520
Granted, Number of Options 17,500
Exercised, Number of Options (7,900)
Forfeited, Number of Options (10,100)
Outstanding, Number of Option, Ending Balance 850,020
Exercisable, Number of Options 631,484
Outstanding, Weighted Average Exercise Price, Beginning Balance $ 11.84
Granted, Weighted-Average Exercise Price $ 17.67
Exercised, Weighted-Average Exercise Price $ 11.53
Forfeited, Weighted-Average Exercise Price $ 15.25
Outstanding, Weighted Average Exercise Price, Ending Balance $ 11.92
Exercisable, Weighted Average Exercise Price $ 11.58
Outstanding, Weighted-Average Grant Date Fair Value, Beginning Balance $ 3.89
Granted, Weighted-Average Grant Date Fair Value $ 5.18
Exercised, Weighted-Average Grant Date Fair Value $ 3.79
Forfeited, Weighted-Average Grant Date Fair Value $ 5.23
Outstanding, Weighted-Average Grant Date Fair Value, Ending Balance $ 3.90
Exercisable, Weighted-Average Grant Date Fair Value $ 3.79
Outstanding, Weighted Average Remaining Contractual Term 5 years 8 months 12 days
Exercisable, Weighted Average Remaining Contractual Term 5 years 4 months 24 days
Outstanding, Aggregate Intrinsic Value Ending balance $ 5,889,000
Exercisable, Aggregate Intrinsic Value $ 4,593,000