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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
	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	$ 21,676us-gaap_IncomeLossFromContinuingOperations	$ 17,501us-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	$ 5,021us-gaap_NetIncomeLoss	$ 3,192us-gaap_NetIncomeLoss	$ (12,104)us-gaap_NetIncomeLoss	$ (17,006)us-gaap_NetIncomeLoss	$ 1,016us-gaap_NetIncomeLoss	$ 5,561us-gaap_NetIncomeLoss	$ 9,506us-gaap_NetIncomeLoss	$ (17,887)us-gaap_NetIncomeLoss	$ (923)us-gaap_NetIncomeLoss	$ 16,244us-gaap_NetIncomeLoss
Basic weighted-average common shares outstanding									9,515us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,445us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,377us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of potentially dilutive common shares										89us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	68us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted-average common shares outstanding									9,515us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,534us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,445us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings (loss) per basic common share:
Continuing operations	$ (1.47)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.62us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.34us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.13)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.26us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.29us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.59us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 1.16us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.65)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 2.29us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 1.87us-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	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ (1.27)us-gaap_EarningsPerShareBasic	$ (1.80)us-gaap_EarningsPerShareBasic	$ 0.11us-gaap_EarningsPerShareBasic	$ 0.59us-gaap_EarningsPerShareBasic	$ 1.01us-gaap_EarningsPerShareBasic	$ (1.88)us-gaap_EarningsPerShareBasic	$ (0.10)us-gaap_EarningsPerShareBasic	$ 1.73us-gaap_EarningsPerShareBasic
Earnings (loss) per diluted common share:
Continuing operations	$ (1.47)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.61us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.33us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.13)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.25us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.29us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.59us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 1.16us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.65)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 2.27us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 1.85us-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	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ (1.27)us-gaap_EarningsPerShareDiluted	$ (1.78)us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.59us-gaap_EarningsPerShareDiluted	$ 1.00us-gaap_EarningsPerShareDiluted	$ (1.88)us-gaap_EarningsPerShareDiluted	$ (0.10)us-gaap_EarningsPerShareDiluted	$ 1.72us-gaap_EarningsPerShareDiluted
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