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Stock-Based Compensation - Summary of Stock Option Activity, SOSARS (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercised (137,000) (280,000) (10,000)
SOSARS [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Outstanding 2,121,454 2,298,288 2,061,877
Granted 368,687 364,114 345,290
Exercised (435,562) (500,074)  
Canceled / forfeited (77,446) (40,874) (108,879)
Ending Balance, Outstanding 1,977,133 2,121,454 2,298,288
Exercisable at December 31, 1,330,816 1,469,537 1,554,852
Vested and expected to vest 1,863,244 2,055,599 2,076,341
Beginning Balance, Weighted Average Exercise Price, Outstanding $ 12.93 $ 12.35 $ 12.28
Weighted Average Exercise Price, Granted $ 18.51 $ 15.58 $ 12.56
Weighted Average Exercise Price, Exercised $ 12.63 $ 12.06  
Weighted Average Exercise Price, Canceled / forfeited $ 16.28 $ 14.31 $ 11.82
Ending Balance, Weighted Average Exercise Price, Outstanding $ 13.91 $ 12.93 $ 12.35
Weighted Average Exercise Price, Exercisable at December 31, $ 12.58 $ 12.30 $ 12.45
Vested and expected to vest       
Weighted average grant date fair value per share $ 5.74 $ 4.94 $ 4.09
Aggregate grant date fair value $ 2,103 $ 1,797 $ 1,412
Black-Scholes assumptions      
Dividend yield 2.16% 2.31% 2.87%
Risk free rate of return 1.01% 1.02% 2.55%
Volatility 39.58% 41.48% 41.91%
Expected life 6 years 6 years 6 years
Compensation expense $ 1,591 $ 1,448 $ 1,564