Guarantor Financial Information - Schedule of Consolidated Statement of Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Statement of Income Captions [Line Items]
Net income (loss)	$ (29,988)	$ (52,994)	$ (74,950)	$ (101,713)
Other comprehensive income (loss):
Foreign currency translation adjustment	4,218	2,552	(1,227)	2,690
Total other comprehensive income (loss)	4,218	2,552	(1,227)	2,690
Total comprehensive income (loss)	(25,770)	(50,442)	(76,177)	(99,023)
Less: Net (income) loss attributable to the noncontrolling interest	(243)	6	(366)	(520)
Total comprehensive income (loss) attributable to inVentiv Health, Inc.	(26,013)	(50,436)	(76,543)	(99,543)
Eliminations [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(12,655)	25,376	(10,467)	41,000
Other comprehensive income (loss):
Foreign currency translation adjustment	(7,709)	(3,357)	1,737	(2,494)
Total other comprehensive income (loss)	(7,709)	(3,357)	1,737	(2,494)
Total comprehensive income (loss)	(20,364)	22,019	(8,730)	38,506
Total comprehensive income (loss) attributable to inVentiv Health, Inc.	(20,364)	22,019	(8,730)	38,506
Inventiv Health Inc [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(30,231)	(52,988)	(75,316)	(102,233)
Other comprehensive income (loss):
Foreign currency translation adjustment	4,218	2,552	(1,227)	2,690
Total other comprehensive income (loss)	4,218	2,552	(1,227)	2,690
Total comprehensive income (loss)	(26,013)	(50,436)	(76,543)	(99,543)
Total comprehensive income (loss) attributable to inVentiv Health, Inc.	(26,013)	(50,436)	(76,543)	(99,543)
Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	13,047	(26,342)	6,871	(47,778)
Other comprehensive income (loss):
Foreign currency translation adjustment	5,113	2,039	(322)	1,342
Total other comprehensive income (loss)	5,113	2,039	(322)	1,342
Total comprehensive income (loss)	18,160	(24,303)	6,549	(46,436)
Total comprehensive income (loss) attributable to inVentiv Health, Inc.	18,160	(24,303)	6,549	(46,436)
Non-Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(149)	960	3,962	7,298
Other comprehensive income (loss):
Foreign currency translation adjustment	2,596	1,318	(1,415)	1,152
Total other comprehensive income (loss)	2,596	1,318	(1,415)	1,152
Total comprehensive income (loss)	2,447	2,278	2,547	8,450
Less: Net (income) loss attributable to the noncontrolling interest	(243)	6	(366)	(520)
Total comprehensive income (loss) attributable to inVentiv Health, Inc.	$ 2,204	$ 2,284	$ 2,181	$ 7,930