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Earnings Per Share - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | |
|---|---|---|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2013
Vested Stock Options [Member]
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Jun. 30, 2013
Vested Stock Options [Member]
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Jun. 30, 2012
Stock Options [Member]
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Jun. 30, 2012
Stock Options [Member]
|
Jun. 30, 2012
Unvested Restricted Shares [Member]
|
Jun. 30, 2012
Unvested Restricted Shares [Member]
|
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||||||
| Shares with anti-dilutive effect | 1.2 | 1.1 | 1.4 | 1.4 | 0.7 | 0.7 | |
| Forfeiture of potentially issuable common stock | 2.0 | ||||||
| Common stock issued in lieu of consulting fee, value | $ 1.0 | ||||||
| Common stock issued in lieu of consulting fee, shares | 0.5 | ||||||
| Reversal of compensation expense | $ 1.3 | ||||||