Equity - Summary of Stock Option Award Activity (Detail) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]
Outstanding at beginning of year, Number of Shares Underlying Options	1,808,987
Exercised, Number of Shares Underlying Options	(131,706)
Forfeited, Number of Shares Underlying Options	(17,175)
Spin-Off adjustment, Number of Shares Underlying Options	339,223
Outstanding at end of year, Number of Shares Underlying Options	1,999,329