Shareholders' Equity - Summary of Preferred Dividends Declared on Preferred Stock Issued (Parenthetical) (Detail) - $ / shares	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Equity [Abstract]
Series E and Series F Preferred Stock prorated dividend related to shares which were cancelled	$ 866.67	$ 866.67
Series E Preferred Stock cancelled, number of shares	4,861	9,833
Series F Preferred Stock cancelled, number of shares	1,639	3,385