Off-Balance Sheet Arrangements Commitments Guarantees and Contingencies (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments And Guarantees [Line Items]
Credit card guarantees	$ 7,900	$ 8,900
Fully collateralized credit card guarantees	1,200	1,500
Rent expense for operating leases	30,600	28,200	$ 24,600
Aggregate future minimum rentals to be received under non-cancelable subleases greater than one year	588
Partnership Interest of a Director [Member]
Commitments And Guarantees [Line Items]
Rent expense for operating leases	$ 925	$ 925	$ 871