Summary of Significant Accounting Policies Retained Deficit (Details) $ in Millions	Mar. 31, 2018 USD ($)
Retained Earnings (Accumulated Deficit) [Abstract]
Cumulative share repurchases	$ 1,241.9
Cumulative dividends declared	$ 440.8

Cumulative Share Repurchases since inception of repurchase programs

No definition available.

Name:	pool_CumulativeShareRepurchases
Namespace Prefix:	pool_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant