Annual report pursuant to Section 13 and 15(d)

Summary of Stock Option Activity (Detail)

v2.4.0.6
Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options Outstanding Beginning Balance 82,166 140,356 1,231,892
Exercise of stock options, net of stock withholdings (60,144) (58,190) (1,091,536)
Number of Options Outstanding Ending Balance 22,022 82,166 140,356
Number of Options Vested at December 31 ,2011 22,022 82,166 140,356
Weighted Average Exercise Price Beginning Balance $ 7.63 $ 7.63 $ 7.63
Weighted Average Exercise Price Exercised $ 7.63 $ 7.63 $ 7.63
Weighted Average Exercise Price Ending Balance $ 7.63 $ 7.63 $ 7.63
Weighted average Exercise Price Vested at December 31 ,2011 $ 7.63 $ 7.63 $ 7.63
Aggregate Intrinsic Value Ending Balance $ 404    
Aggregate Intrinsic Value Vested options at December 31,2012 $ 404