Sale of Commercial Business - Schedule of Carrying Value of Assets and Liabilities Classified as Assets Held for Sale Relates to Commercial Business (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Total current assets held for sale	$ 26,634	$ 33,295
Total long-term assets held for sale	8,814	9,135
Current liabilities:
Total current liabilities held for sale	67,187	56,839
Total liabilities held for sale	16,877	25,673
Commercial Business [Member]
Current assets:
Accounts receivable, net	8,985	17,194
Inventory	15,532	14,554
Prepaid expenses and other current assets	2,117	1,547
Total current assets held for sale	26,634	33,295
Property and equipment, net	1,376	1,553
Intangible assets, net	3,833	3,977
Goodwill	3,605	3,605
Total long-term assets held for sale	8,814	9,135
Current liabilities:
Accounts payable, accrued expenses and other	28,563	20,613
Deferred revenues	38,624	36,226
Total current liabilities held for sale	67,187	56,839
Deferred revenues, net of current portion	16,877	25,673
Total liabilities held for sale	$ 16,877	$ 25,673