Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Segment Customer	Dec. 31, 2012 Customer	Dec. 31, 2011	Dec. 31, 2013 Stock Options [Member]	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Sales [Member] Expedia and Priceline [Member]	Dec. 31, 2012 Sales [Member] Expedia and Priceline [Member]	Dec. 31, 2011 Sales [Member] Expedia and Priceline [Member]	Dec. 31, 2013 Common Stock [Member]	Dec. 20, 2011 Common Stock [Member]	Dec. 31, 2013 Class B Common Stock [Member]	Dec. 31, 2012 Class B Common Stock [Member]
Schedule Of Accounting Policies [Line Items]
Marketable debt securities with maturity	90 days
Weighted average maturity of total invested cash	12 months
Final maturity of marketable securities	3 years
Accounts receivable due period	30 days
Depreciation over the estimated useful lives of the assets					3 years	5 years
Number of reportable segment	1
Minimum probability that the fair value of the reporting unit is less than the carrying amount	50.00%
Amortized estimated useful lives of Intangible assets					2 years	11 years
Foreign exchange losses	$ 200,000	$ 3,200,000	$ 1,000,000
Advertising expense	236,500,000	175,000,000	135,600,000
Prepaid marketing expenses	1,300,000	1,400,000
Stock options vest period				4 years
Deferred merchant payables	29,612,000	1,303,000
Operating cash flow generated	16,800,000
Payable balance acquired with business acquisition	$ 11,500,000
Customer concentration risk							47.00%	48.00%	49.00%
Number of customers accounting for more than 10% of gross trade receivables	0	0
Spin-Off reserve stock split of outstanding	0.5
Common stock, shares outstanding	129,417,089	130,060,138								120,661,020	120,661,020	12,799,999	12,799,999