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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations And Disposal Groups [Abstract]
Net income from discontinued operations	$ 0	$ 0	$ 8,159
Proceeds from sale of assets under asset management operation	$ 0	$ 0	$ 19,294

Amount after tax of income (loss) from a discontinued operation attributable to the parent. 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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