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Schedule of Weighted Average Shares Outstanding (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accounting Policies [Abstract]    
Weighted average number of shares outstanding - basic 32,920 32,739
Stock options 82 0
Non-vested stock and stock units 506 0
Weighted average number of shares outstanding - diluted 33,508 32,739
Anti-dilutive securities 319 875