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Changes in Non-Vested Time Based Awards (Detail) (Time Based Restricted Stock Awards, USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Time Based Restricted Stock Awards
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Non-vested, beginning of period, Shares | 1,176,890 | 952,920 | 885,482 |
| Granted, Shares | 1,570,393 | 811,080 | 488,634 |
| Vested, Shares | (559,763) | (543,593) | (374,351) |
| Forfeited, Shares | (181,799) | (43,517) | (46,845) |
| Non-vested, end of period, Shares | 2,005,721 | 1,176,890 | 952,920 |
| Non-vested, beginning of period, Weighted Average Grant Date Fair Value | $ 12.00 | $ 14.11 | $ 11.40 |
| Granted, Weighted Average Grant Date Fair Value | $ 10.31 | $ 10.16 | $ 16.88 |
| Vested, Weighted Average Grant Date Fair Value | $ 12.47 | $ 12.83 | $ 13.68 |
| Forfeited, Weighted Average Grant Date Fair Value | $ 11.15 | $ 13.18 | $ 14.51 |
| Non-vested, end of period, Weighted Average Grant Date Fair Value | $ 10.62 | $ 12.00 | $ 14.11 |