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Income Taxes - Summary of Expense (Benefit) for Income Taxes (Detail) (USD $)
In Thousands, 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
Current tax expense                      
Federal                 $ 5,650us-gaap_CurrentFederalTaxExpenseBenefit $ 2,629us-gaap_CurrentFederalTaxExpenseBenefit $ 3,806us-gaap_CurrentFederalTaxExpenseBenefit
State                 1,448us-gaap_CurrentStateAndLocalTaxExpenseBenefit 955us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,053us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current tax expense, Gross                 7,098us-gaap_CurrentIncomeTaxExpenseBenefit 3,584us-gaap_CurrentIncomeTaxExpenseBenefit 4,859us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense (benefit)                      
Federal                 3,050us-gaap_DeferredFederalIncomeTaxExpenseBenefit 967us-gaap_DeferredFederalIncomeTaxExpenseBenefit (542)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State                 665us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 208us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (174)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred tax expense (benefit), Gross                 3,715psix_DeferredFederalAndStateIncomeTaxExpenseBenefit 1,175psix_DeferredFederalAndStateIncomeTaxExpenseBenefit (716)psix_DeferredFederalAndStateIncomeTaxExpenseBenefit
Income tax expense $ 3,309us-gaap_IncomeTaxExpenseBenefit $ 3,996us-gaap_IncomeTaxExpenseBenefit $ 2,250us-gaap_IncomeTaxExpenseBenefit $ 1,258us-gaap_IncomeTaxExpenseBenefit $ 1,171us-gaap_IncomeTaxExpenseBenefit $ 1,382us-gaap_IncomeTaxExpenseBenefit $ 1,239us-gaap_IncomeTaxExpenseBenefit $ 967us-gaap_IncomeTaxExpenseBenefit $ 10,813us-gaap_IncomeTaxExpenseBenefit $ 4,759us-gaap_IncomeTaxExpenseBenefit $ 4,143us-gaap_IncomeTaxExpenseBenefit