Employee Benefit Plans - Summary of Company's Participation in Multi-Employer Pension Plans (Detail)	12 Months Ended
	Dec. 31, 2018 Company
Western Conference of Teamsters Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
EIN	916145047
Plan number	001
Pension Protection Act Zone Status	At least 80 percent
Financial Improvement Plan	No
Surcharge Imposed	No
Company Participants	91
Western Conference of Teamsters Pension Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Expiration Date of Collective Bargaining Agreement	Dec. 01, 2019
Western Conference of Teamsters Pension Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Expiration Date of Collective Bargaining Agreement	Apr. 30, 2021
Southern CA Lumber Industry Retirement Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
EIN	956035266
Plan number	001
Pension Protection Act Zone Status	At least 80 percent
Financial Improvement Plan	No
Surcharge Imposed	No
Company Participants	22
Expiration Date of Collective Bargaining Agreement	Jun. 30, 2020
Central States Southeast and Southwest Areas Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
EIN	366044243
Plan number	001
Pension Protection Act Zone Status	Less than 65 percent
Financial Improvement Plan	Implemented
Surcharge Imposed	No
Company Participants	3
Expiration Date of Collective Bargaining Agreement	Dec. 27, 2020