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Schedule of Weighted Average Shares Outstanding (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accounting Policies [Abstract]        
Weighted average number of shares outstanding - basic 33,637 33,197 33,540 33,059
Stock options 329 181 285 134
Non-vested stock and stock units 363 330 378 448
Weighted average number of shares outstanding - diluted 34,329 33,708 34,203 33,641
Anti-dilutive securities 169 199 248 240