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Network
100670 - Disclosure - Stock Benefit Plans, Stock-Based Compensation and Equity Transactions - Summary of Information about Restricted Stock Awards, Restricted Stock Units and Performance-Based Restricted Units Activity (Detail)
(http://alphatecspine.com/20161231/taxonomy/role/DisclosureStockBenefitPlansStockBasedCompensationAndEquityTransactionsSummaryOfInformationAboutRestrictedStockAwardsRestrictedStockUnitsAndPerformanceBasedRestrictedUnitsActivityDetail)
TableSchedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001350653 (http://www.sec.gov/CIK)
Award TypeRestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
 
 
 
Shares, Unvested beginning balance
260,000  
  
Shares, Awarded
969,000  
  
Shares, Vested
(64,000) 
  
Shares, Forfeited
(73,000) 
  
Shares, Unvested ending balance
1,092,000  
 
260,000  
 
 
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
 
 
 
Weighted average grant date fair value, Unvested beginning balance
16.91  
  
Weighted average grant date fair value, Awarded
5.79  
16.11  
16.62  
Weighted average grant date fair value, Vested
9.73  
  
Weighted average grant date fair value, Forfeited
16.65  
  
Weighted average grant date fair value, Unvested ending balance
7.48  
16.91  
 
Weighted average remaining recognition period, Unvested beginning balance
P3Y7D  
P1Y5M23D