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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income-continuing operations	$ 10,983	$ 11,209	$ 6,893	$ 3,526	$ 3,336	$ 3,369	$ 1,850	$ 2,412	$ 32,611	$ 10,967	$ 16,229
Net income (loss)-discontinued operations	941	(46)	(7)	(16)	(105)	(47)	(41)	374	873	180	(630)
Net income	$ 11,924us-gaap_NetIncomeLoss	$ 11,163us-gaap_NetIncomeLoss	$ 6,886us-gaap_NetIncomeLoss	$ 3,510us-gaap_NetIncomeLoss	$ 3,231us-gaap_NetIncomeLoss	$ 3,322us-gaap_NetIncomeLoss	$ 1,809us-gaap_NetIncomeLoss	$ 2,786us-gaap_NetIncomeLoss	$ 33,484us-gaap_NetIncomeLoss	$ 11,147us-gaap_NetIncomeLoss	$ 15,599us-gaap_NetIncomeLoss
Weighted average common shares outstanding
Basic									39,337	38,873	38,068
Incremental shares with dilutive effect:
Diluted									39,499	39,158	38,677
Basic income (loss) per share:
Continuing operations	$ 0.28	$ 0.28	$ 0.18	$ 0.09	$ 0.09	$ 0.09	$ 0.05	$ 0.06	$ 0.83	$ 0.28	$ 0.43
Discontinued Operations	$ 0.02	$ 0.00	$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ 0.00	$ 0.01	$ 0.02	$ 0.00	$ (0.02)
Total Net income per share	$ 0.30us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.08us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ 0.85us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic
Diluted income (loss) per share:
Continuing operations	$ 0.28	$ 0.28	$ 0.17	$ 0.09	$ 0.09	$ 0.08	$ 0.05	$ 0.06	$ 0.83	$ 0.28	$ 0.42
Discontinued Operations	$ 0.02	$ 0.00	$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ 0.00	$ 0.01	$ 0.02	$ 0.00	$ (0.02)
Total Net income per share	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.17us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ 0.85us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted
Employee Stock Option [Member]
Incremental shares with dilutive effect:
Stock options									0	152	422
Restricted Stock [Member]
Incremental shares with dilutive effect:
Stock options									162	133	187

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