Debt - Summary of Debt Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Term note payable-domestic	$ 503,750	$ 525,000
Other debt	2,832	2,092
Total notes payable and other obligations	739,972	627,092
Securitization facility	394,000	298,000
Total notes payable, credit agreements and Securitization Facility	1,133,972	925,092
Current portion	654,890	439,875
Long-term portion	479,082	485,217
Domestic Line of Credit [Member]
Debt Instrument [Line Items]
Revolving line of credit	225,000	100,000
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Revolving line of credit	8,390
Foreign Line of Credit New Zealand [Member]
Debt Instrument [Line Items]
Revolving line of credit