Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Mar. 29, 2012
PIA BBB Bond Fund (Prospectus Summary) | PIA BBB Bond Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return, Heading	rr_RiskReturnHeading	PIA BBB Bond Fund ("BBB Bond Fund")
Investment Objective, Heading	rr_ObjectiveHeading	Investment Objective
investment Objective, Primary	rr_ObjectivePrimaryTextBlock	The BBB Bond Fund's investment objective is to seek to provide a total rate of return that approximates that of bonds rated within the BBB category by Standard & Poor's Rating Group ("Standard & Poor's"), the Baa category by Moody's Investors Services ("Moody's") or the BBB category by Fitch, Inc. ("Fitch").
Expense, Heading	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense, Narrative	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the BBB Bond Fund.
Shareholder Fees, Caption	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment) None
Operating Expenses, Caption	rr_OperatingExpensesCaption	ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover	rr_PortfolioTurnoverTextBlock	The BBB Bond Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 58% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	58.00%
Expense Example, Heading	rr_ExpenseExampleHeading	Example
Expense Example, Narrative	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the BBB Bond Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same (taking into account the voluntary expense limitation only in the first year). Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Investment Strategy, Heading	rr_StrategyHeading	Principal Investment Strategies of the Fund
Investment Strategy, Narrative	rr_StrategyNarrativeTextBlock	Under normal market conditions, the BBB Bond Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in bonds rated BBB by Standard & Poor's, Baa by Moody's or BBB by Fitch. The BBB Bond Fund may invest up to 50% of its total assets in securities of foreign issuers denominated in U.S. dollars, including issuers located in emerging markets. The weighted average duration of the BBB Bond Fund will generally range from five to eight years. Duration is a measure of a debt security's price sensitivity. Higher duration indicates bonds that are more sensitive to interest rate changes. Bonds with shorter duration reduce the risk associated with interest rates. Duration takes into account a debt security's cash flows over time, including the possibility that a debt security might be prepaid by the issuer or redeemed by the holder prior to its stated maturity date. In contrast, maturity measures only the time until final payment is due. In selecting investments for the BBB Bond Fund, the Adviser will primarily consider credit quality, duration and yield. The Fund's annual portfolio turnover rate may exceed 100%. In its effort to provide a total rate of return that approximates that of bonds rated within the BBB category by Standard & Poor's, Baa by Moody's or BBB by Fitch, the BBB Bond Fund may invest up to 20% of its net assets in futures, options and other derivatives. The Fund may sometimes use derivatives as a substitute for taking a position in bonds rated BBB or Baa and/or as part of a strategy designed to reduce exposure to other risks, such as interest rate risk. The Adviser will sell a security as part of its overall investment decision to remove an overvalued security or reposition the BBB Bond Fund's assets into a more attractive security.
Risk, Heading	rr_RiskHeading	Principal Risks of Investing in the Fund
Risk, Narrative	rr_RiskNarrativeTextBlock	Losing all or a portion of your investment is a risk of investing in the BBB Bond Fund. The success of the Fund cannot be guaranteed. There are risks associated with investments in the types of securities in which the Fund invests. These risks include: ·  Market Risk. The prices of the securities in which the BBB Bond Fund invests      may decline for a number of reasons, including in response to economic            developments and perceptions about the creditworthiness of individual issuers.    ·  Management Risk. The BBB Bond Fund is subject to management risk because    it is an actively managed portfolio. The Adviser's management practices and             investment strategies might not work to produce the desired results.           ·  Interest Rate Risk. In general, the value of bonds and other debt securities      falls when interest rates rise. Longer term obligations are usually more          sensitive to interest rate changes than shorter term obligations.              ·  Credit Risk. The issuers of the bonds and other debt securities held by the       BBB Bond Fund may not be able to make interest or principal payments.             ·  Prepayment Risk. Issuers of securities held by the BBB Bond Fund may be able      to prepay principal due on these securities, particularly during periods of       declining interest rates. Securities subject to prepayment risk generally         offer less potential for gains when interest rates decline, and may offer a       greater potential for loss when interest rates rise. Prepayment risk is a         major risk of mortgage-backed securities.                                      ·  Liquidity Risk. Low or lack of trading volume may make it difficult to sell       securities held by the BBB Bond Fund at quoted market prices.                  ·  Derivatives Risk. The BBB Bond Fund may invest in derivative securities for       both bona fide hedging purposes and for speculative purposes. A derivative        security is a financial contract whose value is based on (or "derived from")    a traditional security (such as a bond) or a market index. Derivatives involve      the risk of improper valuation, the risk of ambiguous documentation and the       risk that changes in the value of the derivative may not correlate perfectly      with the underlying security.                                                  ·  Portfolio Turnover Risk. A high portfolio turnover rate (100% or more) has the    potential to result in the realization and distribution to shareholders of        higher capital gains, which may subject you to a higher tax liability. A high    portfolio turnover rate also leads to higher transactions costs.               ·  Leverage Risk. Leverage risk is the risk that losses from a derivative            instrument may be greater than the amount invested in the derivative              instrument. Certain derivatives have the potential for unlimited losses,          regardless of the size of the initial investment.                              ·  Risks Associated with Inflation and Deflation. Inflation risk is the risk that    the rising cost of living may erode the purchasing power of an investment over    time. Deflation risk is the risk that prices throughout the economy decline       over time - the opposite of inflation.                                         ·  Risks Associated with High Yield Securities. The BBB Bond Fund may hold high      yield securities as a result of credit rating downgrades. Securities with         ratings lower than BBB or Baa are known as "high yield" securities (commonly      known as "junk bonds"). High yield securities provide greater income and a        greater opportunity for gains than higher-rated securities but entail greater    risk of loss of principal.                                                        ·  Foreign and Emerging Market Securities Risk. The BBB Bond Fund may invest up      to 50% of its total assets in securities of foreign issuers denominated in        U.S. dollars, including issuers located in emerging markets. Foreign economies    may differ from domestic companies in the same industry. Foreign economies may    differ from domestic companies in the same industry. Investment in emerging       markets involves additional risks, including less social, political and           economic stability, smaller securities markets and lower trading volume,          restrictive national policies and less developed legal structures.
Risk, Lose Money	rr_RiskLoseMoney	Losing all or a portion of your investment is a risk of investing in the BBB Bond Fund.
Bar Chart and Performance Table, Heading	rr_BarChartAndPerformanceTableHeading	Performance
Performance, Narrative	rr_PerformanceNarrativeTextBlock	The following performance information provides some indication of the risks of investing in the BBB Bond Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for the 1 year, 5 year and since inception periods compare with those of broad measures of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available on the Fund's website at www.piamutualfunds.com or by calling the Fund toll-free at 1-800-251-1970.
Performance, Information Illustrates Variability of Returns	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following performance information provides some indication of the risks of investing in the BBB Bond Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for the 1 year, 5 year and since inception periods compare with those of broad measures of market performance.
Performance, Availability Phone Number	rr_PerformanceAvailabilityPhone	1-800-251-1970
Performance, Availability Website Address	rr_PerformanceAvailabilityWebSiteAddress	www.piamutualfunds.com
Performance, Past Does Not Indicate Future	rr_PerformancePastDoesNotIndicateFuture	The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart, Heading	rr_BarChartHeading	Calendar Year Total Returns as of December 31
Bar Chart, Closing	rr_BarChartClosingTextBlock	During the period shown on the bar chart, the BBB Bond Fund's highest total return for a quarter was 11.05% (quarter ended June 30, 2009) and the lowest total return for a quarter was -5.25% (quarter ended September 30, 2008).
Index No Deduction for Fees, Expenses, Taxes	rr_IndexNoDeductionForFeesExpensesTaxes	reflects no deduction for fees, expenses or taxes
Performance Table, Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns were calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table, Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts ("IRAs").
Performance Table, Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon the redemption of Fund shares.
Performance Table, Closing	rr_PerformanceTableClosingTextBlock	The after-tax returns were calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts ("IRAs"). Performance shown for the "since inception" period for the Barclays Capital U.S. Baa Corporate Index is for the period September 30, 2003, through December 31, 2011. The Fund was invested primarily in U.S. Treasury securities on the inception date in September 2003 until mid January 2004 when PIA clients commenced investing in the Fund and the Fund began pursuing fully its investment strategy. Therefore, performance prior to this time is not fully reflective of the Fund's investment strategy. The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon the redemption of Fund shares.
Average Annual Returns, Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (for the periods ended December 31, 2011)
PIA BBB Bond Fund (Prospectus Summary) | PIA BBB Bond Fund | Barclays Capital U.S. Credit Baa Bond Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Barclays Capital U.S. Credit Baa Bond Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	9.48%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	7.95%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	6.53%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 25, 2003
PIA BBB Bond Fund (Prospectus Summary) | PIA BBB Bond Fund | Barclays Capital U.S. Baa Corporate Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Barclays Capital U.S. Baa Corporate Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	9.05%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	7.91%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	6.28%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 30, 2003
PIA BBB Bond Fund (Prospectus Summary) | PIA BBB Bond Fund | Managed Account Completion Shares
Risk Return [Abstract]	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	none	[1]
Other Expenses	rr_OtherExpensesOverAssets	0.13%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.13%
Less: Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.13%)
Net Annual Fund Operating Expenses	rr_NetExpensesOverAssets	none	[1]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-03-30
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	none
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	29
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	60
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	153
Annual Return 2004	rr_AnnualReturn2004	5.41%
Annual Return 2005	rr_AnnualReturn2005	1.13%
Annual Return 2006	rr_AnnualReturn2006	4.25%
Annual Return 2007	rr_AnnualReturn2007	4.89%
Annual Return 2008	rr_AnnualReturn2008	(7.86%)
Annual Return 2009	rr_AnnualReturn2009	24.12%
Annual Return 2010	rr_AnnualReturn2010	10.05%
Annual Return 2011	rr_AnnualReturn2011	9.17%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest total return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	11.05%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest total return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(5.25%)
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Return Before Taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	9.17%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	7.58%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	5.88%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 25, 2003
PIA BBB Bond Fund (Prospectus Summary) | PIA BBB Bond Fund | Managed Account Completion Shares | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Return After Taxes on Distributions
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	6.39%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	5.30%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	3.83%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 25, 2003
PIA BBB Bond Fund (Prospectus Summary) | PIA BBB Bond Fund | Managed Account Completion Shares | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	7.01%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	5.21%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	3.85%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 25, 2003

[1] Pacific Income Advisers, Inc. (the "Adviser") will not charge a fee for its advisory services to the BBB Bond Fund. However, investors in the Fund are clients of the Adviser and pay the Adviser an advisory fee to manage their assets, which include assets invested in the Fund. The Adviser has voluntarily agreed to pay for all operating expenses (excluding acquired fund fees and expenses - "AFFE") incurred by the Fund through at least March 30, 2013 (the "voluntary expense limitation"). This waiver arrangement may be discontinued at any time after March 30, 2013, as long as the Adviser provides Fund shareholders with written notice six months in advance of the discontinuance. The Adviser may not recoup amounts subject to the voluntary expense limitation in future periods. The table shows the net expenses of the Fund as 0.00% reflecting the fact that the Fund is used to implement certain fixed-income strategies that are offered to Eligible Investors (as such are defined in the statutory prospectus). Investors should carefully consider the separate fees charged in connection with investment in the Fund.