Share-Based Compensation - Summary of the Status of Restricted Shares (Detail) (Restricted stock [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested Shares, beginning balance (in shares)	143,031
Nonvested Shares, Granted (in shares)	10,000	62,105	40,000
Nonvested Shares, Vested (in shares)	(62,176)
Nonvested Shares, Forfeited or expired (in shares)	(7,500)		(2,500)
Nonvested Shares, ending balance (in shares)	83,355	143,031
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Exercise Price per Share, Beginning balance	$ 5.07
Weighted Average Exercise Price per Share, Granted	$ 9.48	$ 5.39	$ 5.28
Weighted Average Exercise Price per Share, Vested	$ 4.68
Weighted Average Exercise Price per Share, Forfeited or expired	$ 5.35
Weighted Average Exercise Price per Share, Ending balance	$ 5.86	$ 5.07