Summary of Significant Accounting Policies - Schedule of Cumulative Effect of Changes made to Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Other receivables	$ 35,124		$ 26,578
Deferred tax assets, net	21,427		23,428
Retained earnings	909,611		$ 922,178
ASU 2014-09 [member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Other receivables		$ 26,952
Deferred tax assets, net		23,332
Retained earnings		922,456
ASU 2014-09 [member] | Adjustments Due to ASU 2014-09 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Other receivables	64	374
Deferred tax assets, net		(96)
Retained earnings	$ 175	$ 278