|
Common Stock and Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified |
0 Months Ended | 1 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
|
Aug. 13, 2013
|
Feb. 28, 2013
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Jun. 09, 2009
|
|
| Equity [Abstract] | |||||
| Common shares, Authorized | 75,000,000 | 75,000,000 | 75,000,000 | ||
| Preferred stock, Authorized | 5,000,000 | 5,000,000 | 5,000,000 | ||
| Share repurchase program | $ 50 | $ 25 | |||
| Number of shares repurchased | 1,268,643 | ||||
| Average price of repurchased shares | $ 24.06 | ||||
| Total cost of shares repurchased | 30.5 | ||||
| Amount available under repurchase program | $ 35.9 |