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Reconciliation of Net (loss) Income and Weighted-Average Shares of Common Stock Outstanding for Purposes of Calculating Basic and Diluted Earnings Per Share (Parenthetical) (Detail)
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3 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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| Earnings Per Share Disclosure [Line Items] | ||
| Common stock equivalents excluded from the calculation of diluted earnings per share | 1,108,000 | 641,000 |
| Common Stock Equivalents | ||
| Earnings Per Share Disclosure [Line Items] | ||
| Common stock equivalents excluded from the calculation of diluted earnings per share | 570,000 | |