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Quarterly Financial Information - Summary of Quarterly Financial Information (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] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 175,016 us-gaap_Revenues | $ 174,959 us-gaap_Revenues | $ 151,069 us-gaap_Revenues | $ 135,140 us-gaap_Revenues | $ 144,524 us-gaap_Revenues | $ 147,971 us-gaap_Revenues | $ 128,798 us-gaap_Revenues | $ 111,551 us-gaap_Revenues | $ 636,184 us-gaap_Revenues | $ 532,844 us-gaap_Revenues | $ 402,652 us-gaap_Revenues
Cost of revenues | 140,975 us-gaap_CostOfRevenue | 217,741 us-gaap_CostOfRevenue | 121,217 us-gaap_CostOfRevenue | 125,834 us-gaap_CostOfRevenue | 120,223 us-gaap_CostOfRevenue | 117,785 us-gaap_CostOfRevenue | 105,072 us-gaap_CostOfRevenue | 103,240 us-gaap_CostOfRevenue | 605,767 us-gaap_CostOfRevenue | 446,320 us-gaap_CostOfRevenue | 335,938 us-gaap_CostOfRevenue
Net (loss) income | $ 7,034 us-gaap_NetIncomeLoss | $ (37,818)us-gaap_NetIncomeLoss | $ 7,283 us-gaap_NetIncomeLoss | $ (3,583)us-gaap_NetIncomeLoss | $ 5,561 us-gaap_NetIncomeLoss | $ 8,994 us-gaap_NetIncomeLoss | $ 5,886 us-gaap_NetIncomeLoss | $ (2,549)us-gaap_NetIncomeLoss | $ (27,084)us-gaap_NetIncomeLoss | $ 17,892 us-gaap_NetIncomeLoss | $ 13,131 us-gaap_NetIncomeLoss
Basic (loss) earnings per share | $ 0.99 us-gaap_EarningsPerShareBasic | $ (5.27)us-gaap_EarningsPerShareBasic | $ 1.02 us-gaap_EarningsPerShareBasic | $ (0.50)us-gaap_EarningsPerShareBasic | $ 0.78 us-gaap_EarningsPerShareBasic | $ 1.26 us-gaap_EarningsPerShareBasic | $ 0.83 us-gaap_EarningsPerShareBasic | $ (0.36)us-gaap_EarningsPerShareBasic | $ (3.78)us-gaap_EarningsPerShareBasic | $ 2.52 us-gaap_EarningsPerShareBasic | $ 1.70 us-gaap_EarningsPerShareBasic
Diluted (loss) earnings per share | $ 0.97 us-gaap_EarningsPerShareDiluted | $ (5.27)us-gaap_EarningsPerShareDiluted | $ 0.98 us-gaap_EarningsPerShareDiluted | $ (0.50)us-gaap_EarningsPerShareDiluted | $ 0.74 us-gaap_EarningsPerShareDiluted | $ 1.21 us-gaap_EarningsPerShareDiluted | $ 0.80 us-gaap_EarningsPerShareDiluted | $ (0.36)us-gaap_EarningsPerShareDiluted | $ (3.78)us-gaap_EarningsPerShareDiluted | $ 2.42 us-gaap_EarningsPerShareDiluted | $ 1.67 us-gaap_EarningsPerShareDiluted
Common stock market prices: |  |  |  |  |  |  |  |  |  |  |
High | $ 45.38 bbsi_CommonStockMarketPricesHigh | $ 63.45 bbsi_CommonStockMarketPricesHigh | $ 63.19 bbsi_CommonStockMarketPricesHigh | $ 102.2 bbsi_CommonStockMarketPricesHigh | $ 98.00 bbsi_CommonStockMarketPricesHigh | $ 73.49 bbsi_CommonStockMarketPricesHigh | $ 62.82 bbsi_CommonStockMarketPricesHigh | $ 53.27 bbsi_CommonStockMarketPricesHigh |  |  |
Low | $ 18.25 bbsi_CommonStockMarketPricesLow | $ 39.47 bbsi_CommonStockMarketPricesLow | $ 41.96 bbsi_CommonStockMarketPricesLow | $ 57.82 bbsi_CommonStockMarketPricesLow | $ 66.33 bbsi_CommonStockMarketPricesLow | $ 48.08 bbsi_CommonStockMarketPricesLow | $ 48.50 bbsi_CommonStockMarketPricesLow | $ 38.15 bbsi_CommonStockMarketPricesLow |  |  |

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