Fair Value Disclosures - Fair Value Adjustments Related to Contingent Consideration Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition Contingent Consideration [Line Items]
Change in fair value of contingent purchase consideration	$ 684,328	$ 1,013	$ 690,287	$ 5,013
MDV3800 [Member]
Business Acquisition Contingent Consideration [Line Items]
Change in fair value of contingent purchase consideration	682,615		685,592
MDV3800 [Member] | R&D expense [Member]
Business Acquisition Contingent Consideration [Line Items]
Change in fair value of contingent purchase consideration	8,632		9,124
MDV3800 [Member] | SG&A expense [Member]
Business Acquisition Contingent Consideration [Line Items]
Change in fair value of contingent purchase consideration	673,983		676,468
MDV9300 [Member]
Business Acquisition Contingent Consideration [Line Items]
Change in fair value of contingent purchase consideration	1,713	1,013	4,695	5,013
MDV9300 [Member] | R&D expense [Member]
Business Acquisition Contingent Consideration [Line Items]
Change in fair value of contingent purchase consideration	365	(70)	1,013	930
MDV9300 [Member] | SG&A expense [Member]
Business Acquisition Contingent Consideration [Line Items]
Change in fair value of contingent purchase consideration	$ 1,348	$ 1,083	$ 3,682	$ 4,083