Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net earnings of Flowserve Corporation	$ 13,220	$ 41,878	$ 28,363	$ 60,929
Dividends on restricted shares not expected to vest	0	0	0	0
Earnings attributable to common and participating shareholders	$ 13,220	$ 41,878	$ 28,363	$ 60,929
Weighted average shares:
Common stock (in shares)	130,816	130,646	130,765	130,520
Participating securities (in shares)	28	86	38	127
Denominator for basic earnings per common share (in shares)	130,844	130,732	130,803	130,647
Effect of potentially dilutive securities (in shares)	382	609	358	661
Denominator for diluted earnings per common share (in shares)	131,226	131,341	131,161	131,308
Earnings per common share:
Basic (in dollars per share)	$ 0.10	$ 0.32	$ 0.22	$ 0.47
Diluted (in dollars per share)	$ 0.10	$ 0.32	$ 0.22	$ 0.46