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Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Incentive Stock Option Plan
Dec. 31, 2012
Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of Shares, Outstanding         561,029 705,345
Number of Shares, Expected to Vest         560,972 699,537
Number of Shares, Exercisable         554,362 179,345
Weighted Average Exercise Price, Outstanding $ 7.76 $ 7.70 $ 7.44 $ 7.65 $ 7.76 $ 7.70
Weighted Average Exercise Price, Expected to Vest         $ 7.76 $ 7.70
Weighted Average Exercisable, Exercise Price $ 7.70 $ 7.95 $ 7.26 $ 7.77 $ 7.70 $ 7.95
Weighted Average Remaining Life, Outstanding         83 months 91 months
Weighted Average Remaining Contractual Life, Expected to Vest         83 months 91 months
Weighted Average Remaining Contractual Life, Exercisable         83 months 78 months
Intrinsic Value, Outstanding         $ 9,276 $ 16,481
Intrinsic Value, Expected to Vest         9,275 16,345
Intrinsic Value, Exercisable         $ 9,196 $ 4,147