Recent Accounting Developments - Additional Information (Detail) - Adjustments for New Accounting Principle [Member] $ in Thousands	Jan. 01, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets recorded for previously unrecognized excess tax benefits on share-based payment awards	$ 81,544
Deferred tax assets, valuation allowance	$ 12,090