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Redeemable Noncontrolling Interests - Additional Information (Detail)
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Dec. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| travelmob [Member] | ||
| Redeemable Noncontrolling Interest [Line Items] | ||
| Percentage of ownership interest | 68.50% | |
| Bookabach [Member] | ||
| Redeemable Noncontrolling Interest [Line Items] | ||
| Percentage of ownership interest | 55.00% | |
| Percentage of additional ownership interest acquired | 20.00% |