CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
Income Statement [Abstract]
Income tax provision on unrealized gain on investment in equity securities	$ 200	$ 0	$ 0	$ 0

Other Comprehensive Income (Loss), Reclassification of Gain on Investment in Equity Securities, Net of Tax, to Retained Earnings from the Effect of an Accounting Change, Tax

No definition available.

Name:	asps_OtherComprehensiveIncomeLossReclassificationofGainonInvestmentinEquitySecuritiesNetofTaxtoRetainedEarningsfromtheEffectofanAccountingChangeTax
Namespace Prefix:	asps_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration