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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
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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 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 11,209 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 6,893 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 3,526 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 3,336 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 3,369 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 1,850 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 2,412 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 32,611 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 10,967 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 16,229 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Net income (loss)-discontinued operations | 941 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (46)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (7)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (16)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (105)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (47)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (41)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 374 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 873 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 180 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (630)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income | $ 11,924 us-gaap_NetIncomeLoss | $ 11,163 us-gaap_NetIncomeLoss | $ 6,886 us-gaap_NetIncomeLoss | $ 3,510 us-gaap_NetIncomeLoss | $ 3,231 us-gaap_NetIncomeLoss | $ 3,322 us-gaap_NetIncomeLoss | $ 1,809 us-gaap_NetIncomeLoss | $ 2,786 us-gaap_NetIncomeLoss | $ 33,484 us-gaap_NetIncomeLoss | $ 11,147 us-gaap_NetIncomeLoss | $ 15,599 us-gaap_NetIncomeLoss
Weighted average common shares outstanding |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  | 39,337 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 38,873 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 38,068 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares with dilutive effect: |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  | 39,499 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 39,158 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 38,677 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.18 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.05 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.06 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.83 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.43 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued Operations | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total Net income per share | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.18 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.08 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic | $ 0.07 us-gaap_EarningsPerShareBasic | $ 0.85 us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.41 us-gaap_EarningsPerShareBasic
Diluted income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.17 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.08 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.05 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.06 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.83 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.42 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued Operations | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total Net income per share | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 0.08 us-gaap_EarningsPerShareDiluted | $ 0.08 us-gaap_EarningsPerShareDiluted | $ 0.05 us-gaap_EarningsPerShareDiluted | $ 0.07 us-gaap_EarningsPerShareDiluted | $ 0.85 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.40 us-gaap_EarningsPerShareDiluted
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |
Incremental shares with dilutive effect: |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 152 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 422 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Incremental shares with dilutive effect: |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  | 162 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 133 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 187 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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