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Summary of Changes in Accumulated Balances of AOCI Including Current Period Other Comprehensive Income (Loss) and Reclassifications Out of AOCI (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance [1]     $ 2,808,663  
Adjusted balance at January 1, 2018     2,828,711  
Other comprehensive income (loss) before reclassifications $ 25,108 $ (18,894) 13,862 $ (21,527)
Less: net gain (loss) reclassified from AOCI (2,659) 695 (8,444) 6,463
Tax effect (351) (89) 112 516
Net current-period other comprehensive income (loss) 27,416 (19,678) 22,418 (27,474)
Ending Balance 2,885,104   2,885,104  
Unrealized Gains (Losses) on Cash Flow Hedges        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (23,673) 6,291 (20,232) 13,006
Impact of change in accounting principle [2]     0  
Adjusted balance at January 1, 2018     (20,232)  
Other comprehensive income (loss) before reclassifications 23,582 (19,165) 14,356 (23,364)
Less: net gain (loss) reclassified from AOCI (2,659) 695 (8,444) 3,211
Tax effect 0 0 0 0
Net current-period other comprehensive income (loss) 26,241 (19,860) 22,800 (26,575)
Ending Balance 2,568 (13,569) 2,568 (13,569)
Unrealized Gains (Losses) on Available-for-Sale Debt Securities        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (4,866) (1,258) (2,722) (178)
Impact of change in accounting principle [2]     (586)  
Adjusted balance at January 1, 2018     (3,308)  
Other comprehensive income (loss) before reclassifications 1,531 267 (490) 1,834
Less: net gain (loss) reclassified from AOCI 0 0 0 3,252
Tax effect (351) (89) 112 516
Net current-period other comprehensive income (loss) 1,180 178 (378) (902)
Ending Balance (3,686) (1,080) (3,686) (1,080)
Foreign Currency Items        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (6) (13) (7) (12)
Impact of change in accounting principle [2]     0  
Adjusted balance at January 1, 2018     (7)  
Other comprehensive income (loss) before reclassifications (5) 4 (4) 3
Less: net gain (loss) reclassified from AOCI 0 0 0 0
Tax effect 0 0 0 0
Net current-period other comprehensive income (loss) (5) 4 (4) 3
Ending Balance (11) (9) (11) (9)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (28,545) 5,020 (22,961) 12,816
Impact of change in accounting principle [2]     (586)  
Adjusted balance at January 1, 2018     (23,547)  
Ending Balance $ (1,129) $ (14,658) $ (1,129) $ (14,658)
[1] December 31, 2017 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on February 26, 2018.
[2] As of January 1, 2018, the Company early adopted the requirements of ASU 2018-02. The amount represents the reclassification from Accumulated Other Comprehensive Income (Loss) to Accumulated Deficit in the first quarter of 2018 related to the adoption of ASU 2018-02. See Note 4 for additional discussion