Debt - Summary of Debt Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Term note payable-domestic	$ 510,625	$ 525,000
Other debt	24,116	22,391
Total notes payable and other obligations	632,088	647,391
Securitization facility	402,000	298,000
Total notes payable, credit agreements and Securitization Facility	1,034,088	945,391
Current portion	548,091	460,174
Long-term portion	485,997	485,217
Domestic Line of Credit [Member]
Debt Instrument [Line Items]
Revolving line of credit	85,000	100,000
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Revolving line of credit	12,347
Foreign Line of Credit New Zealand [Member]
Debt Instrument [Line Items]
Revolving line of credit