Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Schedule Of Income Tax [Line Items]
Valuation allowance resulting in income tax benefit	$ 8,253,000	$ 8,253,000	$ 13,725,000
Unrecognized stock-based compensation	98,210,000	98,210,000		111,635,000
NOLs deemed worthless		3,487,000
Deferred tax asset related to NOLs	0	0
Income tax expense/(benefit)	9,634,000	5,440,000
Gross deferred tax asset	5,472,000	5,472,000
Credit to additional paid-in capital for the amount of NOLs from stock-based compensation	13,649,000	13,649,000
Income tax rate		38.38%
NOLs available for deferred tax asset	21,503,000	21,503,000
Foreign Subsidiaries [Member]
Schedule Of Income Tax [Line Items]
NOLs available for deferred tax asset	2,318,000	2,318,000
Deferred tax asset related to NOLs, valuation allowance	$ 487,000	$ 487,000
Previously Reported [Member]
Schedule Of Income Tax [Line Items]
Income tax rate		45.00%