Schedule of Future Minimum Obligations for Purchases of Inventory, Other Assets, and Services (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Commitments and Contingencies Disclosure [Line Items]
Future minimum obligations for purchases of inventory, other assets, and services - 2014	$ 361,915
Future minimum obligations for purchases of inventory, other assets, and services - 2015	15,838
Future minimum obligations for purchases of inventory, other assets, and services - 2016	4,483
Future minimum obligations for purchases of inventory, other assets, and services - 2017	1,038
Future minimum obligations for purchases of inventory, other assets, and services - 2018
Total future minimum obligations for purchases of inventory, other assets, and services	$ 383,274