Equity (Detail) (USD $) Share data in Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Feb. 01, 2014
Stock Repurchase [Line Items]
Stock Repurchased During Period, Value		25,036,000
Common Stock [Member]
Stock Repurchase [Line Items]
Stock Repurchase Program, Authorized Amount			25,000,000
Repurchase of common stock (in shares)		1,200
Stock Repurchased During Period, Value	$ 25,000,000