General and Administrative - Summary of General and Administrative Expense (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Significant non cash charges [Abstract]
Average performance factor used to calculate the accrual related to the anticipated fair value of the PSUs issue	17.00%	15.00%

Average performance factor used to calculate the accrual related to the anticipated fair value of the PSUs issue.

No definition available.

Name:	wpm_AveragePerformanceFactorUsedToCalculateTheAccrualRelatedToAnticipatedFairValueOfPSUsIssue
Namespace Prefix:	wpm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration