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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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