Income (Loss) Per Common Share - Additional Information (Detail)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||||
Weighted average number of shares, Restricted stock liability awards | 2,800,000 | 2,600,000 | 2,800,000 | 2,700,000 |
Stock Appreciation Rights (SARs)
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Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||||
Stock excluded from earning per share calculation | 161,000 | 252,000 |