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Stock-Based Compensation - Summary of Activity for Options (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Options, Outstanding - beginning of period 255,649 420,712 1,793,214
Options, Exercised (88,336) (123,650) (1,351,684)
Options, Forfeited or expired (31,580) (41,413) (20,818)
Options, Outstanding - end of period 135,733 255,649 420,712
Options, Exercisable at end of period 135,733 255,649 420,712
Weighted Average Exercise Price, Outstanding - beginning of period $ 21.74 $ 21.97 $ 22.38
Weighted Average Exercise Price, Exercised $ 21.15 $ 18.78 $ 22.46
Weighted Average Exercise Price, Forfeited or expired $ 27.04 $ 32.32 $ 22.66
Weighted Average Exercise Price, Outstanding - end of period $ 20.88 $ 21.74 $ 21.97
Weighted Average Exercise Price, Exercisable at end of period $ 20.88 $ 21.74 $ 21.97