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Equity Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 58 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Dec. 31, 2014
Equity [Abstract] |  |  |  |  |  |  |  |  |
Repurchases of common shares (in shares) |  |  |  |  |  | 368,468 | 136,874 | 943,909 |
Weighted average purchase price per share (in $ per share) |  |  |  |  |  | $ 122.09 | $ 191.79 | $ 129.95 |
Total cost of treasury shares acquired |  |  |  |  |  | $ 45,000 | $ 26,300 | $ 122,700 |
Common stock available to repurchase (in shares) | 256,091 |  |  |  |  | 256,091 |  | 256,091 |
Cash dividends declared per share (in $ per share) | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 1.35 | $ 0.90 |  |
Total cash dividends |  |  |  |  |  | $ 12,136 | $ 8,333 |  |
Dividends payable | $ 4,258 |  |  |  |  | $ 4,258 |  | $ 4,258 | $ 4,270
Dividend, to be paid date |  |  |  |  |  | Nov. 13, 2015 |  |  |
Dividend, record date |  |  |  |  |  | Oct. 30, 2015 |  |  |

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