Note New Accounting Pronouncement - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2018
New accounting pronouncements or change in accounting principle
Operating lease right of use asset	$ 132,538		$ 0
Opearing lease liability	148,095
Cumulative effect of accounting change	$ 4,905			$ 1,935
ASU 2016-02
New accounting pronouncements or change in accounting principle
Operating lease right of use asset		$ 139,000
Deferred rent liabilities		15,000
Opearing lease liability		154,000
Cumulative effect of accounting change		$ 4,800