Income Taxes - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended
	Dec. 31, 2013	Sep. 30, 2014
Income Tax Contingency
Increase noncurrent deferred tax liabilities	$ 1,334,000
Reduction of deferred tax asset for net operating losses		5,300,000
Uncertain tax positions assumed in connection with an acquisition		5,963,000
Estimated unrecognized tax benefits, decrease as a result of tax position taken in prior years		(8,530,000)
Unrecognized tax benefits that would impact effective tax rate		$ 9,083,000
Earliest Tax Year
Income Tax Contingency
Open tax years		2009
Earliest Tax Year | Foreign Tax Authority
Income Tax Contingency
Expiration date of statute of limitations		2010
Earliest Tax Year | Domestic Tax Authority
Income Tax Contingency
Expiration date of statute of limitations		2010
Latest Tax Year
Income Tax Contingency
Open tax years		2013
Latest Tax Year | Foreign Tax Authority
Income Tax Contingency
Expiration date of statute of limitations		2011
Latest Tax Year | Domestic Tax Authority
Income Tax Contingency
Expiration date of statute of limitations		2011