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Certain Relationships and Related Party Transactions - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Apr. 30, 2014
Feb. 28, 2014
Dec. 31, 2016
Secondary Public Offering            
Related Party Transaction [Line Items]            
Secondary offering of common stock   5,392,499 40,250,000 25,000,000 28,750,000  
Common stock, price per share   $ 30.46 $ 29.95 $ 29.78 $ 29.17  
Stock repurchased from underwriter     5,000,000 3,428,179    
Fixed 7.125% Senior Notes            
Related Party Transaction [Line Items]            
Senior Notes, stated interest rate 7.125%          
Percentage of principal amount redeemed 103.563%          
Lawrence E. Dewey | Fixed 7.125% Senior Notes            
Related Party Transaction [Line Items]            
Senior notes held by executive officers $ 100,000          
David S. Graziosi | Fixed 7.125% Senior Notes            
Related Party Transaction [Line Items]            
Senior notes held by executive officers $ 450,000          
James A. Star            
Related Party Transaction [Line Items]            
Description of related party transaction           James A. Star, a member of the Company’s Board of Directors, has an indirect material interest in Gillig as a result of trusts for the benefit of his wife and children collectively owning an approximately 5% interest in the entities that directly and indirectly own Gillig LLC. In addition, all of the remaining direct and indirect interests in Gillig LLC are owned by trusts for the benefit of members of Mr. Star’s wife’s immediate and extended family. Mr. Star also has an indirect material interest in GD as a result of trusts for the benefit of his wife, children and members of his wife’s family collectively owning approximately 10% of the outstanding shares of common stock of GD.
James A. Star | Gillig            
Related Party Transaction [Line Items]            
Percentage of ownership interest           5.00%
James A. Star | Gillig | Maximum            
Related Party Transaction [Line Items]            
Net sales from related parties           $ 20,000,000
James A. Star | GD            
Related Party Transaction [Line Items]            
Percentage of ownership interest           10.00%
James A. Star | GD | Maximum            
Related Party Transaction [Line Items]            
Net sales from related parties           $ 5,000,000