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Future Maturities of Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Debt Instrument [Line Items]  
2015 $ 1,019,000us-gaap_LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths
2016 4,000us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo
2017 3,000us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree
2018 1,000us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour
Total 1,027,000us-gaap_LongTermDebtAndCapitalLeaseObligations
Less: current portion (1,019,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Note payable - noncurrent portion $ 8,000posc_LongTermDebtCapitalLeaseObligationsCurrentNoncurrent