Capital Stock - (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended					12 Months Ended					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2013 Former Affiliated Entity [Member] Stock Options [Member]	Dec. 31, 2013 6% Tangible Equity Units [Member]	Nov. 27, 2013 6% Tangible Equity Units [Member]	Dec. 31, 2013 Convertible Debt [Member]	Feb. 26, 2013 Convertible Debt [Member]	Dec. 31, 2013 Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock purchase right description											One-quarter of a preferred stock purchase right
Number of rights issued per share of common stock											0.25
Stockholders to purchase conditions description											One one-hundredth of a share of newly issued Series A Junior Participating Preferred Stock
Number of securities called by preferred stock purchase right											0.001
Preferred stock exercise price											100
Minimum percentage of beneficial ownership to acquire exercisable rights											20.00%
Redemption price of rights											$ 0.001
Redemption time of rights											10 days
Expiry date of rights											Dec. 11, 2017
Interest rate percentage							6.00%	6.00%	3.75%	3.75%
Options to purchase shares of common stock				1,133,000		779,000
Weighted average exercise price				$ 22.35		$ 25.11
Weighted average remaining contractual term				5 years		2 years
Aggregate intrinsic value				$ 6,433	$ 1,956	$ 711
Number of shares repurchased	0	94,450
Value of share repurchased		1,409	12,977
Common Stock Repurchased Since Announcement Of Strategic Initiative	2,002,145
Value Of Common Stock Repurchased Since Announcement Of Strategic Initiative	$ 29,564
Maximum percentage of shares repurchased under strategic initiative	20.00%
Maximum number of shares repurchased under strategic initiative	7,000,000