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Equity Transactions - Additional Information (Detail) (USD $) | 12 Months Ended |  | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | May 31, 2013 | Sep. 30, 2013 Public Offering [Member]
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock, shares issued |  |  |  | 1,300,000
Common stock value | $ 191,578,000 |  |  | $ 191,800,000
Treasury stock, shares acquired | 105,000 | 90,000 |  |
Weighted average purchase price per share | $ 187.61 | $ 99.30 |  |
Total cost of treasury shares acquired | 19,700,000 | 8,900,000 |  |
Treasury stock, shares | 350,000 | 245,000 |  |
Treasury stock, at cost | $ 37,438,000 | $ 17,734,000 |  |
Repurchased additional shares of common stock, shares |  |  | 350,000 |
Common stock remaining authorized for repurchase | 350,000 |  |  |
Repurchase program expiration date | May 21, 2016 |  |  |

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