Commitments and Contingencies - Additional Information (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Alorica Inc. [Member]
Commitments [Line Items]
Discontinued operations, indemnification liability for breaches of representations and warranties	$ 13,750

Disposal group including discontinued operation indemnification liability for breeches of representations and warranties.

No definition available.

Name:	wstc_DisposalGroupIncludingDiscontinuedOperationIndemnificationLiabilityForBreechesOfRepresentationsAndWarranties
Namespace Prefix:	wstc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant