Overview and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Mar. 31, 2018
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Initial offering period		December 2011
Online game revenue and income from operations		$ 600
Impact on reported earnings per share		$ 0	$ 0
Discontinued online game revenue and income from operations		$ 200	$ 400
Current operating lease liabilities		9,056
Non-current operating lease liabilities		20,098
Lease liability recognized		$ 29,154
ASU 2016-02 [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Right-of-use assets	$ 9,100
Current operating lease liabilities	7,600
Non-current operating lease liabilities	12,400
Derecognize restructuring plan liability	10,900
Lease liability recognized	$ 10,900
Operating lease, term		12 months
Lease and nonlease component, description		the lessor practical expedient is limited to circumstances in which the nonlease component or components otherwise would be accounted for under the new revenue guidance and both (i) the timing and pattern of transfer are the same for the nonlease component(s) and associated lease component and (ii) the lease component, if accounted for separately, would be classified as an operating lease.