Commitments and Contingencies - Employee Relations (Details)	12 Months Ended
	Dec. 31, 2015 agreement
Collective bargaining arrangements
Percentage of employees represented by labor unions	13.00%
Simpson Strong-Tie | San Bernardino County
Collective bargaining arrangements
Collective bargaining agreements, number	2
Simpson Strong-Tie | San Bernardino County | Tool and die craftsmen and maintenance workers
Collective bargaining arrangements
Collective bargaining agreements, number	1
Simpson Strong-Tie | Stockton
Collective bargaining arrangements
Collective bargaining agreements, number	2