Banker and legal fee.

No definition available.

Name:	prty_BankerAndLegalFee
Namespace Prefix:	prty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Term loan senior secured leverage ratio.

+ References

No definition available.

+ Details

Name:	prty_TermLoanSeniorSecuredLeverageRatio
Namespace Prefix:	prty_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Write-off of capitalized call premium.

+ References

No definition available.

+ Details

Name:	prty_WriteOffOfCapitalizedCallPremium
Namespace Prefix:	prty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Write Off Of Original Issue Discount

+ References

No definition available.

+ Details

Name:	prty_WriteOffOfOriginalIssueDiscount
Namespace Prefix:	prty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Incremental percentage increase (decrease) in the stated rate on a debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentInterestRateIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

Name:	us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=prty_TermLoanCreditAgreementAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=prty_AlternateBaseInterestRateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
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Long-Term Obligations - Term Loan Credit Agreement Amendment - Additional Information (Detail) - Term Loan Credit Agreement Amendment [Member] - Secured Debt [Member] $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2018	Mar. 31, 2018 USD ($)	Dec. 31, 2017
Debt Instrument [Line Items]
Banker and legal fees		$ 856
Other Expense [Member]
Debt Instrument [Line Items]
Write off of deferred financing costs		186
Write off of capitalized original issue discount		102
Write off of capitalized call premium		58
Banker and legal fees		$ 800
Maximum [Member]
Debt Instrument [Line Items]
Senior secured leverage ratio	3.2
Minimum [Member]
Debt Instrument [Line Items]
Senior secured leverage ratio	1.0
Alternate Base Interest Rate Loans [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%		2.00%
Debt instrument interest rate increase decrease	1.50%
LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.75%		3.00%
Debt instrument interest rate increase decrease	2.50%