Equity - Summary of Stock Options Granted (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Outstanding at beginning of year, Number of Shares Underlying Options	1,958,633	1,808,987	2,027,089
Exercised, Number of Shares Underlying Options		(131,706)	(212,017)
Forfeited, Number of Shares Underlying Options	(281,479)	(57,871)	(6,085)
Spin-Off adjustment, Number of Shares Underlying Options		339,223
Outstanding at end of year, Number of Shares Underlying Options	1,677,154	1,958,633	1,808,987
Exercisable at end of year, Number of Shares Underlying Options	1,677,154	1,846,465	1,510,929
Outstanding at beginning of year, Weighted Average Exercise Price	$ 28.43	$ 33.13	$ 32.44
Exercised, Weighted Average Exercise Price		20.08	26.66
Forfeited, Weighted Average Exercise Price	22.17	30.18	31.35
Outstanding at end of year, Weighted Average Exercise Price	29.48	28.43	33.13
Exercisable at end of year, Weighted Average Exercise Price	$ 29.48	$ 28.35	$ 32.47