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Summary of Significant Accounting Policies - Summary of Basic and Diluted Weighted Average Common Shares (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]      
Basic weighted average common shares outstanding 17,927 18,713 20,861
Weighted average common equivalent shares 216 294 492
Diluted weighted average common shares outstanding 18,143 19,007 21,353
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive 1,237 587 658