Stock-Based Employee Compensation - Outstanding Stock Options (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 2.30
Shares, Outstanding	258,723
Weighted-Average Life (Years), Outstanding	5 years 8 months 1 day
Intrinsic Values, Outstanding	$ 1,436
Weighted-Average Exercise Price, Exercisable	$ 2.30
Shares, Exercisable	194,042
Intrinsic Values Exercisable, at stock option plan exercise price	1,077
Stock Options Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 5.77
Shares, Outstanding	31,923
Weighted-Average Life (Years), Outstanding	3 years 8 months 1 day
Intrinsic Values, Outstanding	66
Weighted-Average Exercise Price, Exercisable	$ 5.77
Shares, Exercisable	31,923
Intrinsic Values Exercisable, at stock option plan exercise price	66
Stock Options Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 5.85
Shares, Outstanding	142,382
Weighted-Average Life (Years), Outstanding	4 years 6 months 29 days
Intrinsic Values, Outstanding	285
Weighted-Average Exercise Price, Exercisable	$ 5.85
Shares, Exercisable	142,382
Intrinsic Values Exercisable, at stock option plan exercise price	285
Stock Options Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding	433,028
Weighted-Average Life (Years), Outstanding	5 years 1 month 28 days
Intrinsic Values, Outstanding	1,787
Weighted-Average Exercise Price, Exercisable	$ 3.97
Shares, Exercisable	368,347
Intrinsic Values Exercisable, at stock option plan exercise price	$ 1,428