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Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Results of Operations (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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 157,022 us-gaap_Revenues | $ 180,269 us-gaap_Revenues | $ 177,466 us-gaap_Revenues | $ 204,726 us-gaap_Revenues | $ 146,652 us-gaap_Revenues | $ 165,145 us-gaap_Revenues | $ 168,296 us-gaap_Revenues | $ 197,078 us-gaap_Revenues | $ 719,483 us-gaap_Revenues | $ 677,171 us-gaap_Revenues | $ 612,689 us-gaap_Revenues
Operating expenses | 154,316 us-gaap_CostOfRevenue | 155,233 us-gaap_CostOfRevenue | 158,317 us-gaap_CostOfRevenue | 161,938 us-gaap_CostOfRevenue | 144,291 us-gaap_CostOfRevenue | 146,464 us-gaap_CostOfRevenue | 147,202 us-gaap_CostOfRevenue | 155,382 us-gaap_CostOfRevenue | 629,804 us-gaap_CostOfRevenue | 593,339 us-gaap_CostOfRevenue | 540,305 us-gaap_CostOfRevenue
Gross margin | 2,706 us-gaap_GrossProfit | 25,036 us-gaap_GrossProfit | 19,149 us-gaap_GrossProfit | 42,788 us-gaap_GrossProfit | 2,361 us-gaap_GrossProfit | 18,681 us-gaap_GrossProfit | 21,094 us-gaap_GrossProfit | 41,696 us-gaap_GrossProfit | 89,679 us-gaap_GrossProfit | 83,832 us-gaap_GrossProfit | 72,384 us-gaap_GrossProfit
Corporate general and administrative | 6,790 us-gaap_GeneralAndAdministrativeExpense | 8,889 us-gaap_GeneralAndAdministrativeExpense | 8,306 us-gaap_GeneralAndAdministrativeExpense | 10,198 us-gaap_GeneralAndAdministrativeExpense | 7,821 us-gaap_GeneralAndAdministrativeExpense | 8,944 us-gaap_GeneralAndAdministrativeExpense | 7,649 us-gaap_GeneralAndAdministrativeExpense | 9,984 us-gaap_GeneralAndAdministrativeExpense | 34,183 us-gaap_GeneralAndAdministrativeExpense | 34,398 us-gaap_GeneralAndAdministrativeExpense | 30,209 us-gaap_GeneralAndAdministrativeExpense
Operating income (loss) | (4,084)us-gaap_OperatingIncomeLoss | 16,147 us-gaap_OperatingIncomeLoss | 10,843 us-gaap_OperatingIncomeLoss | 32,590 us-gaap_OperatingIncomeLoss | (5,460)us-gaap_OperatingIncomeLoss | 9,737 us-gaap_OperatingIncomeLoss | 13,445 us-gaap_OperatingIncomeLoss | 31,712 us-gaap_OperatingIncomeLoss | 55,496 us-gaap_OperatingIncomeLoss | 49,434 us-gaap_OperatingIncomeLoss | 42,175 us-gaap_OperatingIncomeLoss
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Interest expense | (2,991)us-gaap_InterestExpense | (3,123)us-gaap_InterestExpense | (3,577)us-gaap_InterestExpense | (3,433)us-gaap_InterestExpense | (3,358)us-gaap_InterestExpense | (3,815)us-gaap_InterestExpense | (4,145)us-gaap_InterestExpense | (4,056)us-gaap_InterestExpense | (13,124)us-gaap_InterestExpense | (15,374)us-gaap_InterestExpense | (14,999)us-gaap_InterestExpense
Gain on sale of operations, net | 1,210 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 17 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 68 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 8 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 7 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 6 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 48 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 18 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 1,303 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 79 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 2,766 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Other income (loss), net | 2,350 us-gaap_OtherNonoperatingIncomeExpense | (1,368)us-gaap_OtherNonoperatingIncomeExpense | 3,936 us-gaap_OtherNonoperatingIncomeExpense | 1,975 us-gaap_OtherNonoperatingIncomeExpense | 3,203 us-gaap_OtherNonoperatingIncomeExpense | 2,371 us-gaap_OtherNonoperatingIncomeExpense | 515 us-gaap_OtherNonoperatingIncomeExpense | 1,728 us-gaap_OtherNonoperatingIncomeExpense | 6,893 us-gaap_OtherNonoperatingIncomeExpense | 7,817 us-gaap_OtherNonoperatingIncomeExpense | 8,215 us-gaap_OtherNonoperatingIncomeExpense
Total other (expense) income, net | 569 us-gaap_NonoperatingIncomeExpense | (4,474)us-gaap_NonoperatingIncomeExpense | 427 us-gaap_NonoperatingIncomeExpense | (1,450)us-gaap_NonoperatingIncomeExpense | (148)us-gaap_NonoperatingIncomeExpense | (1,438)us-gaap_NonoperatingIncomeExpense | (3,582)us-gaap_NonoperatingIncomeExpense | (2,310)us-gaap_NonoperatingIncomeExpense | (4,928)us-gaap_NonoperatingIncomeExpense | (7,478)us-gaap_NonoperatingIncomeExpense | (4,018)us-gaap_NonoperatingIncomeExpense
Income (loss) from continuing operations before income tax expense (benefit) | (3,515)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 11,673 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 11,270 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 31,140 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (5,608)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 8,299 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 9,863 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 29,402 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 50,568 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 41,956 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 38,157 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense (benefit) | (2,137)us-gaap_IncomeTaxExpenseBenefit | 4,353 us-gaap_IncomeTaxExpenseBenefit | 4,824 us-gaap_IncomeTaxExpenseBenefit | 13,114 us-gaap_IncomeTaxExpenseBenefit | (2,698)us-gaap_IncomeTaxExpenseBenefit | 2,707 us-gaap_IncomeTaxExpenseBenefit | 4,260 us-gaap_IncomeTaxExpenseBenefit | 12,308 us-gaap_IncomeTaxExpenseBenefit | 20,154 us-gaap_IncomeTaxExpenseBenefit | 16,577 us-gaap_IncomeTaxExpenseBenefit | 14,364 us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations | (1,378)us-gaap_IncomeLossFromContinuingOperations | 7,320 us-gaap_IncomeLossFromContinuingOperations | 6,446 us-gaap_IncomeLossFromContinuingOperations | 18,026 us-gaap_IncomeLossFromContinuingOperations | (2,910)us-gaap_IncomeLossFromContinuingOperations | 5,592 us-gaap_IncomeLossFromContinuingOperations | 5,603 us-gaap_IncomeLossFromContinuingOperations | 17,094 us-gaap_IncomeLossFromContinuingOperations | 30,414 us-gaap_IncomeLossFromContinuingOperations | 25,379 us-gaap_IncomeLossFromContinuingOperations | 23,793 us-gaap_IncomeLossFromContinuingOperations
(Loss) income from operations of discontinued operations, net of tax | 60 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (239)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (312)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (263)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (1,130)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 453 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 1,639 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 1,186 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (754)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 2,148 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 7,263 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
(Loss) gain on disposal of discontinued operations, net of tax | (7)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 607 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (27)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (474)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 93 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 56,315 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 1,905 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 23 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 99 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 58,336 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 90 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net income (loss) | $ (1,325)us-gaap_NetIncomeLoss | $ 7,688 us-gaap_NetIncomeLoss | $ 6,107 us-gaap_NetIncomeLoss | $ 17,289 us-gaap_NetIncomeLoss | $ (3,947)us-gaap_NetIncomeLoss | $ 62,360 us-gaap_NetIncomeLoss | $ 9,147 us-gaap_NetIncomeLoss | $ 18,303 us-gaap_NetIncomeLoss | $ 29,759 us-gaap_NetIncomeLoss | $ 85,863 us-gaap_NetIncomeLoss | $ 31,146 us-gaap_NetIncomeLoss
Basic: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ (0.03)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.15 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.13 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.37 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.06)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.12 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.11 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.35 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.63 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.52 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.49 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 1.16 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.07 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 1.25 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.14 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income (loss) | $ (0.03)us-gaap_EarningsPerShareBasic | $ 0.16 us-gaap_EarningsPerShareBasic | $ 0.13 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ (0.08)us-gaap_EarningsPerShareBasic | $ 1.28 us-gaap_EarningsPerShareBasic | $ 0.18 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.62 us-gaap_EarningsPerShareBasic | $ 1.77 us-gaap_EarningsPerShareBasic | $ 0.63 us-gaap_EarningsPerShareBasic
Diluted: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ (0.03)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.14 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.12 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.06)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.11 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.11 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.59 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.52 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.48 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 1.16 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.07 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 1.23 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.15 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income (loss) | $ (0.03)us-gaap_EarningsPerShareDiluted | $ 0.15 us-gaap_EarningsPerShareDiluted | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted | $ (0.08)us-gaap_EarningsPerShareDiluted | $ 1.27 us-gaap_EarningsPerShareDiluted | $ 0.18 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.58 us-gaap_EarningsPerShareDiluted | $ 1.75 us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted
Basic weighted average common shares | 48,455 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,451 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,273 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,182 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 46,681 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,504 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 49,639 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 49,417 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,343 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,632 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 49,002 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average common shares | 48,455 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 51,209 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,052 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,618 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 46,981 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 49,003 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 49,929 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 49,836 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 51,487 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 49,141 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 49,252 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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