Earnings Per Common Share - Details of Earnings Per Share Calculations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income-continuing operations	$ 3,336	$ 3,369	$ 1,850	$ 2,412	$ 2,154	$ 4,682	$ 7,398	$ 1,994	$ 10,967	$ 16,229	$ 24,251
Net income (loss)-discontinued operations	(105)	(47)	(41)	374	(137)	(173)	(236)	(84)	180	(630)	(6,118)
Net income	$ 3,231	$ 3,322	$ 1,809	$ 2,786	$ 2,017	$ 4,509	$ 7,162	$ 1,910	$ 11,147	$ 15,599	$ 18,133
Weighted average common shares outstanding
Basic									38,873	38,068	37,555
Incremental shares with dilutive effect:
Diluted									39,158	38,677	38,568
Basic income (loss) per share
Continuing operations	$ 0.09	$ 0.09	$ 0.05	$ 0.06	$ 0.05	$ 0.12	$ 0.19	$ 0.05	$ 0.28	$ 0.43	$ 0.65
Discontinued operations	$ (0.01)	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ 0.00	$ (0.02)	$ (0.16)
Total Net income per share	$ 0.08	$ 0.09	$ 0.05	$ 0.07	$ 0.05	$ 0.12	$ 0.18	$ 0.05	$ 0.28	$ 0.41	$ 0.48
Diluted income (loss) per share
Continuing operations	$ 0.09	$ 0.08	$ 0.05	$ 0.06	$ 0.05	$ 0.12	$ 0.19	$ 0.05	$ 0.28	$ 0.42	$ 0.63
Discontinued operations	$ (0.01)	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ 0.00	$ (0.02)	$ (0.16)
Total Net income per share	$ 0.08	$ 0.08	$ 0.05	$ 0.07	$ 0.05	$ 0.12	$ 0.18	$ 0.05	$ 0.28	$ 0.40	$ 0.47
Stock Options [Member]
Incremental shares with dilutive effect:
Restricted stock awards									152	422	824
Restricted Stock [Member]
Incremental shares with dilutive effect:
Restricted stock awards									133	187	189

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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