Equity - Summary of Status of Non-Vested Stock Options (Detail) - Non-Vested Stock Options [Member]	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year, Number of Shares Underlying Options | shares	112,168
Shares Under Outstanding Options, Vested | shares	(112,168)
Weighted-Average Grant-Date Fair Value, Beginning balance | $ / shares	$ 13.05
Weighted-Average Grant-Date Fair Value Vested | $ / shares	$ 13.05