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Capital Stock - (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 15, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 27, 2013	Feb. 26, 2013
Class of Stock [Line Items]
Settlement of tangible equity units, Shares	7,857,000
Number of shares repurchased		283,976		1,491,187
Value of share repurchased		$ 3,537		$ 24,595
Common stock repurchased since announcement of strategic initiative		3,777,308
Value of common stock repurchased since announcement of strategic initiative		$ 57,696
Maximum percentage of shares repurchased under strategic initiative		20.00%
Maximum number of shares repurchased under strategic initiative		7,000,000
Former Affiliated Entity | Pre Spin Stock Option Awards
Class of Stock [Line Items]
Options to purchase shares of common stock		234,764
Weighted average exercise price		$ 30.56
Aggregate intrinsic value		$ 0
6% Tangible Equity Units
Class of Stock [Line Items]
Interest rate percentage					6.00%	6.00%
Convertible Debt
Class of Stock [Line Items]
Interest rate percentage		3.75%			3.75%		3.75%
Preferred Stock
Class of Stock [Line Items]
Expiry date of rights			Dec. 11, 2017

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Maximum Percentage Of Shares Repurchased Under Strategic Initiative

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Contractual interest rate for funds borrowed, under the debt agreement.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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