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Summary of Significant Accounting Policies - Schedule of Options to Purchase Common Shares and Restricted Stock Units (Detail)
In Thousands, unless otherwise specified |
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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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Total options and restricted stock units | 3,581 | 1,826 | 984 |
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Options to Purchase Common Shares [Member]
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Total options and restricted stock units | 2,389 | 1,679 | 984 |
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Restricted Stock Units [Member]
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Total options and restricted stock units | 1,192 | 147 | |