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Stockholders' Equity - Activity Under Stock Option Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Number of Shares Underlying Stock Options  
Outstanding beginning balance (shares) | shares 668
Granted (shares) | shares 0
Exercised (shares) | shares (172)
Cancelled or expired (shares) | shares 0
Outstanding ending balance (shares) | shares 496
Vested and expected to vest at December 31, 2013 (shares) | shares 496
Exercisable at December 31, 2013 (shares) | shares 496
Weighted Average Exercise Price per Share  
Outstanding beginning balance (usd per share) | $ / shares $ 15.57
Granted (usd per share) | $ / shares 0.00
Exercised (usd per share) | $ / shares 16.82
Cancelled or expired (usd per share) | $ / shares 0.00
Outstanding ending balance (usd per share) | $ / shares 15.14
Vested and expected to vest at December 31, 2013 (usd per share) | $ / shares 15.14
Exercisable at December 31, 2013 (usd per share) | $ / shares $ 15.14
Weighted Average Remaining Contractual Term (in years)  
Outstanding as of December 31, 2015 2 years 18 days
Vested and expected to vest at December 31, 2015 2 years 18 days
Exercisable at December 31, 2015 2 years 18 days
Aggregate Intrinsic Value  
Outstanding as of December 31, 2015 | $ $ 25,163
Vested and expected to vest at December 31, 2015 | $ 25,163
Exercisable at December 31, 2015 | $ $ 25,163