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Summary of Significant Accounting Policies - Reconciliation of Weighted-Average Common Shares Outstanding Used in the Calculation of Basic Net Income (Loss) Per Share and Diluted Net Income (Loss) Per Share (Detail) - shares
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accounting Policies [Abstract]        
Weighted average common shares outstanding (in shares) 40,499 40,347 40,455 40,024
Assumed conversion of restricted stock (in shares) 51 106 95 143
Diluted weighted average common stock outstanding (in shares) 40,550 40,453 40,550 40,167