Summary of Cash, Cash Equivalents and Restricted Cash Reported In Condensed Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Cash And Cash Equivalents Period Increase Decrease [Abstract]
Cash and cash equivalents		$ 58,905	$ 105,220
Restricted cash and cash equivalents	[1]	$ 95,932	$ 94,465
Restricted Cash and Cash Equivalents, Noncurrent, Asset, Statement of Financial Position [Extensible List]		us-gaap:OtherAssetsMiscellaneousNoncurrent	us-gaap:OtherAssetsMiscellaneousNoncurrent
Total cash, cash equivalents and restricted cash		$ 154,837	$ 199,685

[1] Restricted cash and cash equivalents is included in other assets on the accompanying consolidated balance sheet.