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Summary of Significant Accounting Policies - Summary of Earnings (Loss) per Basic and Diluted Weighted Average Common Shares Outstanding (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
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | $ (6,173)us-gaap_IncomeLossFromContinuingOperations | $ 21,676 us-gaap_IncomeLossFromContinuingOperations | $ 17,501 us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operations |  |  |  |  |  |  |  |  | (11,714)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (22,599)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (1,257)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss) | $ (13,996)us-gaap_NetIncomeLoss | $ 5,021 us-gaap_NetIncomeLoss | $ 3,192 us-gaap_NetIncomeLoss | $ (12,104)us-gaap_NetIncomeLoss | $ (17,006)us-gaap_NetIncomeLoss | $ 1,016 us-gaap_NetIncomeLoss | $ 5,561 us-gaap_NetIncomeLoss | $ 9,506 us-gaap_NetIncomeLoss | $ (17,887)us-gaap_NetIncomeLoss | $ (923)us-gaap_NetIncomeLoss | $ 16,244 us-gaap_NetIncomeLoss
Basic weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 9,515 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 9,445 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 9,377 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of potentially dilutive common shares |  |  |  |  |  |  |  |  |  | 89 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 68 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 9,515 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 9,534 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 9,445 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings (loss) per basic common share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ (1.47)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.62 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.13)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.26 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.29 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.59 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.16 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.65)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 2.29 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.87 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations |  | $ (0.09)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare |  | $ (1.14)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (2.06)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.18)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare |  | $ (0.15)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (1.23)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (2.39)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.14)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare
Total | $ (1.47)us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.34 us-gaap_EarningsPerShareBasic | $ (1.27)us-gaap_EarningsPerShareBasic | $ (1.80)us-gaap_EarningsPerShareBasic | $ 0.11 us-gaap_EarningsPerShareBasic | $ 0.59 us-gaap_EarningsPerShareBasic | $ 1.01 us-gaap_EarningsPerShareBasic | $ (1.88)us-gaap_EarningsPerShareBasic | $ (0.10)us-gaap_EarningsPerShareBasic | $ 1.73 us-gaap_EarningsPerShareBasic
Earnings (loss) per diluted common share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ (1.47)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.61 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.33 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.13)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.25 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.29 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.59 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.16 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.65)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.27 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.85 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations |  | $ (0.09)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare |  | $ (1.14)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (2.03)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.18)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare |  | $ (0.16)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (1.23)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (2.37)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.13)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare
Total | $ (1.47)us-gaap_EarningsPerShareDiluted | $ 0.52 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted | $ (1.27)us-gaap_EarningsPerShareDiluted | $ (1.78)us-gaap_EarningsPerShareDiluted | $ 0.11 us-gaap_EarningsPerShareDiluted | $ 0.59 us-gaap_EarningsPerShareDiluted | $ 1.00 us-gaap_EarningsPerShareDiluted | $ (1.88)us-gaap_EarningsPerShareDiluted | $ (0.10)us-gaap_EarningsPerShareDiluted | $ 1.72 us-gaap_EarningsPerShareDiluted
Antidilutive shares excluded from net earnings per diluted common share calculation |  |  |  |  |  |  |  |  | 65 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 93 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 92 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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