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Schedule of Weighted Average Shares Outstanding (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accounting Policies [Abstract]    
Weighted average number of shares outstanding - basic 33,443 32,920
Stock options 239 82
Non-vested stock and stock units 391 506
Weighted average number of shares outstanding - diluted 34,073 33,508
Anti-dilutive securities 332 319