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Supplemental Cash Flow Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental Cash Flow Information [Abstract]      
Taxes paid $ 5,666us-gaap_IncomeTaxesPaid $ 4,125us-gaap_IncomeTaxesPaid $ 2,825us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities:      
Fixed assets acquired with accounts payable or accrued liabilities 4,899us-gaap_CapitalExpendituresIncurredButNotYetPaid 2,308us-gaap_CapitalExpendituresIncurredButNotYetPaid 940us-gaap_CapitalExpendituresIncurredButNotYetPaid
Unclaimed merger consideration liability $ 0algn_MergerConsideration $ 0algn_MergerConsideration $ 1,575algn_MergerConsideration