Share-Based Compensation - Summary of Option Activity (Detail) (Option activity under the 2003 Plan [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Option activity under the 2003 Plan [Member]
Schedule Of Stock Option Activity [Line Items]
Option outstanding, Shares, Beginning balance	104,947
Option granted, Shares
Option Exercised, Shares	(13,500)
Option forfeited, Shares
Option outstanding, Shares, Ending balance	91,447
Option Exercisable, Shares, Ending balance	56,832
Option outstanding, Weighted Average Exercise Price, Beginning balance	$ 11.14
Option granted, weighted average exercise price
Option Exercised, Weighted Average Exercise Price	$ 10.10
Option forfeited, Weighted average exercise price
Option outstanding, Weighted Average Exercise Price, Ending balance	$ 11.29
Option Exercisable, Weighted Average Exercise Price, Ending balance	$ 11.22
Option outstanding, Weighted Average Remaining Term	5 years 5 months 9 days
Option Exercisable, Weighted Average Remaining Term	4 years 3 months 7 days
Option outstanding, Aggregate Intrinsic Value	$ 1,283,619
Option Exercisable, Aggregate Intrinsic Value	$ 801,761