Deferred Revenues (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Deferred Revenue Arrangement [Line Items]
Deferred merchandise trust unrealized gains (losses)	$ (6,923)	$ (24,685)
Deferred revenues	868,194	815,421
Deferred selling and obtaining costs	118,410	111,542
Contract Revenues
Deferred Revenue Arrangement [Line Items]
Deferred revenues	785,072	759,812
Merchandise Trusts
Deferred Revenue Arrangement [Line Items]
Deferred revenues	$ 90,045	$ 80,294