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Changes in Non-Vested TSR Awards (Detail) (TSR, USD $)
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12 Months Ended |
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Dec. 31, 2013
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TSR
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Granted, Shares | 354,517 |
| Vested, Shares | |
| Forfeited, Shares | (14,351) |
| Non-vested, end of period, Shares | 340,166 |
| Granted, Weighted Average Grant Date Fair Value | $ 15.91 |
| Vested, Weighted Average Grant Date Fair Value | |
| Forfeited, Weighted Average Grant Date Fair Value | $ 15.91 |
| Non-vested, end of period, Weighted Average Grant Date Fair Value | $ 15.91 |