Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair value measurements transfers between level 1, level 2, or level 3	$ 0	$ 0	$ 0	$ 0

Fair value assets transfers between level 1, level 2 and level 3.

No definition available.

Name:	medp_FairValueAssetsTransfersBetweenLevel1Level2AndLevel3
Namespace Prefix:	medp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration