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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017
Summary Of Significant Accounting Policies [Line Items]
Discontinued operations	$ 0	$ 540,485,000	$ 0	$ 539,538,000
Maximum [Member] \| Silver Creek Pharmaceuticals Inc [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership interest (as a percent)					50.00%

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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