Significant Accounting Policies and Recently Issued Accounting Standards - Accrued Liabilities Related to Insurance Programs (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Accrued Liabilities [Line Items]
Insurance liability	$ 31,371	$ 28,660
Automobile and general liability insurance [Member]
Schedule Of Accrued Liabilities [Line Items]
Insurance liability	21,769	22,485
Workers' compensation [Member]
Schedule Of Accrued Liabilities [Line Items]
Insurance liability	8,360	5,516
Health insurance [Member]
Schedule Of Accrued Liabilities [Line Items]
Insurance liability	$ 1,242	$ 659