Schedule of Weighted Average Shares Outstanding (Detail) - shares
shares in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]      
Weighted average number of shares outstanding - basic 33,018 32,301 31,247
Stock options 0 1 0
Non-vested stock and stock units 0 521 0
Weighted average number of shares outstanding - diluted 33,018 32,823 31,247
Anti-dilutive securities 922 106 688