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