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Stockholders' Equity - Summary of the Company's Stock Options Activity (Detail) - Stock Options - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding      
Number of Options outstanding, beginning of year (in shares) 1,103,000 1,641,000 3,366,000
Number of Options, Granted (in shares) 0 0 0
Number of Options, Exercised (in shares) (95,000) (525,000) (1,644,000)
Number of Options, Expired / terminated (in shares) 0 (13,000) (81,000)
Number of Options outstanding, end of year (in shares) 1,008,000 1,103,000 1,641,000
Number of Options exercisable, end of year (in shares) 977,000 1,072,000 1,606,000
Number of Options expected to vest, end of year (in shares) 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Weighted Average Exercise Price, Options outstanding, beginning of year (in dollars per share) $ 5.37 $ 5.26 $ 6.15
Weighted Average Exercise Price, Granted (in dollars per share) 0.00 0.00 0.00
Weighted Average Exercise Price, Exercised (in dollars per share) 5.02 4.95 6.69
Weighted Average Exercise Price, Expired / terminated (in dollars per share) 0.00 7.27 16.59
Weighted Average Exercise Price, Options outstanding, end of year (in dollars per share) 5.40 5.37 5.26
Weighted Average Exercise Price, Options exercisable, end of year (in dollars per share) 5.42 5.39 5.27
Weighted Average Exercise Price, Options expected to vest, end of year (in dollars per share) $ 4.75