Segment Information - Income from Discontinued Operations (Detail) - USD ($)	12 Months Ended	39 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015
Segment Reporting [Abstract]
Litigation recoveries		$ 4,839,000	$ 26,000	$ 5,658,000
Other (expenses), net		(1,196,000)	(977,000)
Income (loss) from discontinued operations before income tax	$ 0	3,643,000	(951,000)
Income tax expense (benefit) from discontinued operations	0	1,409,000	(382,000)
Income (loss) from discontinued operations, net of income tax expense (benefit)	$ 0	$ 2,234,000	$ (569,263)

Amount before tax of income (loss) from a discontinued operation. 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.

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

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- Definition

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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